weed out

find and remove people or things that are not wanted or not good enough

C1

What does "weed sb/sth out" mean?

To weed out something or someone means to go through a group carefully and remove the elements that are harmful, ineffective, or do not meet the required standard. The metaphor comes from gardening: just as you pull unwanted weeds from among healthy plants, you identify and remove unwanted people or things from a larger system. This phrasal verb carries a deliberate, purposeful tone — it implies that someone is actively making judgements about what belongs and what does not. It appears most naturally in formal and institutional contexts such as recruitment, government reform, law enforcement, and corporate management. Crucially, it suggests that what is removed is not merely different but genuinely harmful or inferior in some way.

Examples

How to use it

weed out + object

The most common unseparated pattern, typically used with longer noun phrases or when the object is more complex.

The new screening process is designed to weed out unqualified applicants before the interview stage.

weed + object + out

The separated form is natural with short noun phrases and is often preferred when the object is brief and specific.

The committee vowed to weed the bad apples out before the next election cycle.

weed + pronoun + out

When the object is a pronoun, separation is mandatory — the pronoun must always go between 'weed' and 'out'.

We know there are corrupt employees in the department, and we intend to weed them out.

be weeded out

The passive form is very natural, especially in formal or institutional contexts where the agent is vague or unimportant.

Several fraudulent claims were weeded out during the internal audit.

aim / try / be designed to + weed out + object

The infinitive construction is particularly common, reflecting the forward-looking and purposeful nature of this phrasal verb.

The revised admissions policy aims to weed out applicants who do not meet the academic threshold.

Common Collocations

weed out corruptionweed out bad candidatesweed out extremistsweed out underperformersweed out fraudulent claimsweed out troublemakers

Common Mistakes

Pronoun after 'out'

When the object is a pronoun, it must always be placed between 'weed' and 'out'. Placing it after 'out' is ungrammatical in English.

✗ The organisation promised to weed out them.
✓ The organisation promised to weed them out.
Confusing 'weed out' with 'root out'

'Root out' emphasises hunting down and destroying something deeply embedded or hidden, often suggesting a more intensive investigation. 'Weed out' focuses on sorting through a group and removing unwanted elements from it, with an implication of screening or selection.

✗ Investigators weeded out the source of the corruption after months of undercover work.
✓ Investigators rooted out the source of the corruption after months of undercover work.
Separating with a very long noun phrase

Although 'weed out' is separable, inserting a very long or complex noun phrase between 'weed' and 'out' sounds unnatural. Use the unseparated form when the object is lengthy.

✗ They weeded officers with a history of misconduct and ties to criminal networks out.
✓ They weeded out officers with a history of misconduct and ties to criminal networks.

Usage

This phrasal verb is formal and is most at home in professional, political, or journalistic contexts — it would sound out of place in casual conversation. It is equally common in British and American English.

Frequently Asked Questions

Can 'weed out' be used to talk about removing just one person?

Technically yes, but it sounds most natural when referring to multiple people or a category of problematic elements within a larger group. Using it for a single individual can sound slightly odd unless the context makes clear that person represents a broader type of problem.

Is 'weed out' appropriate in formal writing, such as reports or official documents?

Yes — in fact, formal and semi-formal contexts are where 'weed out' feels most at home. It is widely used in journalism, institutional reports, policy documents, and corporate communication. It would, however, sound out of place in very casual everyday speech.

Can I use 'weed out' in the passive?

Yes, the passive is very natural with this phrasal verb. Forms like 'be weeded out' and 'get weeded out' are both commonly used, with the 'get' passive being slightly more informal. The passive is especially useful when the focus is on what is removed rather than who is doing the removing.

Does 'weed out' only apply to people, or can it be used for things too?

It applies to both people and things. You can weed out unsuitable candidates (people) but also fraudulent claims, defective products, spam, or misinformation (things). What they share is that they are unwanted or harmful elements mixed in with a larger group of legitimate ones.

Where does the expression 'weed out' come from?

The phrase comes from the literal practice of weeding a garden — pulling out unwanted plants that compete with or harm the ones you want to keep. This origin explains the connotation of careful, deliberate sorting: you have to identify which plants are weeds before you can remove them.

Related Phrasal Verbs

root sth/sb out

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