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root out

B2 neutral separable transitive
In simple words

To find something bad that is hiding and get rid of it completely.

Literal meaning: To remove a plant by pulling it out by its roots — the figurative sense derives from this image of complete removal.

Meanings

1 B2 idiomatic neutral

To find and eliminate something harmful or unwanted that is hidden or deeply embedded in a system.

"The new director promised to root out corruption throughout the entire organisation."

Grammar: separable
2 B2 informal

To find something by searching thoroughly, often among a collection of things.

"He managed to root out an old photograph from the bottom of the box."

Grammar: separable
3 B1 neutral

To remove a plant completely by pulling it up from its roots.

"We spent the afternoon rooting out the brambles that had spread across the garden."

Grammar: separable
Usage notes

Common in political, organisational, and investigative contexts. The image is of digging up a plant by its roots so it cannot regrow — implying thorough, complete removal. Also used for physically removing a plant by its roots (the literal sense). Frequently followed by 'corruption', 'terrorism', 'inefficiency'.

Commonly used with

corruption fraud extremism inefficiency wrongdoing dissidents weeds

Forms

Base
root out
I/you/we/they
3rd person
roots out
he/she/it
Past simple
rooted out
yesterday
Past participle
rooted out
have + pp
-ing form
rooting out
continuous

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