mix up

2 meanings

Meanings
  1. 1 think one person or thing is another B1
  2. 2 put things in the wrong order B1
1 mix sb up

think one person or thing is another

B1

What does "mix up" mean in this sense?

To mix up two things or people means to mistake one for the other — treating A as if it were B, or B as if it were A. This often happens when two things look similar, sound alike, or are easily confused. For example, a teacher might mix up two students who have similar names, or someone might mix up the dates of two appointments. The confusion usually happens by accident, and the result is that the wrong thing is chosen, sent, or said. It's a very common and natural expression in everyday English.

Examples

How to use it

mix up + noun object

The most common pattern, where two things or people are confused with each other. The object usually refers to two or more similar things.

I always mix up the words 'affect' and 'effect' — they seem so similar.

mix + pronoun + up

When the object is a pronoun, it must go between 'mix' and 'up'. It can never come after 'up'.

The twins look so alike that even their teacher mixes them up sometimes.

mix + short noun object + up

With short noun objects, placing the object between 'mix' and 'up' is very natural and common.

She mixed the dates up and arrived a whole day early for her flight.

be / get mixed up

The passive form is very natural and is often used to describe the result of the confusion, especially when no one is being blamed.

The two bookings got mixed up, so both customers were sent to the same room.

tend to / easy to + mix up + noun

This structure is common when talking about things that are habitually or typically confused.

It's easy to mix up the two airports if you're not familiar with the city.

Common Collocations

mix up the namesmix up the datesmix up the twinsmix up the ordersmix up the wordsmix up the details

Common Mistakes

Pronoun placement

When the object is a pronoun like 'them', 'it', or 'us', it must go between 'mix' and 'up'. Placing the pronoun after 'up' is incorrect.

✗ I mixed up them because they look exactly the same.
✓ I mixed them up because they look exactly the same.
Confusing 'mix up' with 'mess up'

'Mix up' specifically means to confuse two things with each other — mistaking one for another. 'Mess up' means to make a general mistake or ruin something, without the idea of swapping or misidentifying.

✗ I mixed up the presentation completely — I forgot all my key points.
✓ I messed up the presentation completely — I forgot all my key points.
Confusing 'mix up' (verb) with 'mixed up' (adjective)

The predicate adjective 'mixed up' can describe a person who is emotionally confused or troubled, which is a different meaning. Make sure your sentence clearly shows an act of mistaking one thing for another, not a state of emotional distress.

✗ After the bad news, she really mixed up the situation.
✓ She was really mixed up after the bad news. / She mixed up the two files and sent them to the wrong people.

Usage

This phrasal verb is neutral and works in both spoken and written English. The noun form 'a mix-up' (with a hyphen) is also very common and useful to know.

2 mix sth up

put things in the wrong order

B1

Sense 2: What does "mix sth up" mean?

To mix something up means to put a group of things into the wrong order or to disturb their organisation so they become muddled. It usually happens by accident — someone handles a pile of papers carelessly, or items get shuffled around during a move, and suddenly nothing is where it should be. The key idea is that there is a set of things that had (or should have) a clear order or arrangement, and that order has been lost. You will often hear it with collections of physical items like files, pages, cards, or documents, but it also works for things like a schedule or a playlist. The result is usually frustration — you know the right order exists, but now you have to sort everything out again.

Examples

How to use it

mix up + collection of things

The most common pattern: use 'mix up' with a plural or collective noun referring to a set of items that had some order.

He mixed up all the pages when he dropped the report on the floor.

mix + object + up

Separation is very natural with this phrasal verb, especially when the object is short.

Someone mixed the folders up and now the invoices are in the wrong section.

mix + pronoun + up

When the object is a pronoun, it must go between 'mix' and 'up' — there is no other option.

The cards were in perfect order before you mixed them up.

get/be mixed up

The passive is common, especially when nobody knows who caused the disorder or it happened accidentally.

All the delivery packages got mixed up at the sorting centre.

Common Collocations

papersfilespagesdocumentscardsfolders

Common Mistakes

Pronoun after the particle

When the object is a pronoun like 'them' or 'it', you must place it between 'mix' and 'up'. Putting it after 'up' is not correct in English.

✗ I can't believe you mixed up them.
✓ I can't believe you mixed them up.
Confusing the two meanings of 'mix up'

'Mix up' can also mean to confuse one person or thing for another (e.g. mistaking one twin for the other). In this 'disorganise' sense, the object is always a collection of things, not two separate items being compared. If your sentence could mean 'mistake X for Y', you are using a different sense.

✗ I always mix up salt and sugar in the cupboard. [when you mean you mistake one for the other]
✓ I always mix up the spice jars in the cupboard. [disorder] / I always mix salt up with sugar. [confuse one for the other — a different sense]

Usage

This is a neutral, everyday phrasal verb used in both spoken and written English. Be careful not to confuse this meaning (put things in the wrong order) with the other common meaning of 'mix up', which means to confuse one thing or person for another.

Frequently Asked Questions

Can 'mix up' be used in the passive?

Yes, and it's very common! Both 'be mixed up' and 'get mixed up' are natural ways to describe the result of a mix-up, especially when you don't want to blame anyone. For example: 'The orders were mixed up' or 'The tickets got mixed up at the front desk.'

Is 'mix-up' (with a hyphen) the same thing?

'Mix-up' is the noun form and it's used very frequently. Instead of saying 'There was a moment when things were mixed up', you can simply say 'There was a mix-up.' It works well in both spoken and written English, for example: 'Sorry for the mix-up with your order.'

Does 'mix up' always mean confusing two things? I've seen it used differently.

This sense of 'mix up' specifically means mistaking one thing or person for another. There is another sense where 'get mixed up in/with' means to become involved in something, like 'He got mixed up in some trouble at work.' These are different meanings, so pay attention to what follows the verb.

What kinds of things can I 'mix up'?

Almost anything that can be confused with something else! Common examples include names, dates, words, orders, files, tickets, and appointments. You can also use it more abstractly, like mixing up cause and effect, or mixing up fact and fiction.

Can I say 'I always mix up' without mentioning what I'm confusing?

In informal speech, you can sometimes drop the object if the context makes it clear what you mean — for example, 'I always mix up when it comes to those two words.' However, it's more natural and clear to include the object: 'I always mix those two words up.'

Does 'mix up' always need an object?

Yes, in this 'disorganise' sense, 'mix up' always needs an object — it cannot stand alone without one. You need to say what was mixed up, for example 'he mixed up the documents' or 'everything got mixed up'.

What kinds of things can you 'mix up' in this sense?

The most common objects are collections of physical items that have a natural order — things like pages, files, cards, folders, documents, and packages. You can also use it more broadly for things like a schedule or a playlist, as long as the idea of a disturbed order or arrangement makes sense.

Is 'a mix-up' related to this meaning?

The noun 'a mix-up' does come from the same phrasal verb, but it is more commonly associated with the 'confuse one thing for another' sense — for example, a mix-up with bookings or names. When you mean that things have been put in the wrong order, it is more natural to use the verb form than the noun.

Can I use 'mix up' to talk about something that will happen in the future?

You can use simple future forms like 'will mix up' — for example, 'if you're not careful, you'll mix up the pages'. However, forms like 'will be mixing up' sound unnatural with this meaning. Stick to simple or perfect tenses for the most natural-sounding sentences.

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