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scrub in

C1 neutral inseparable intransitive
In simple words

To wash your hands and arms in a special medical way so you can go into an operating room

Literal meaning: To scrub (wash vigorously) in order to go in — 'in' refers to entering the sterile surgical environment

Meanings

1 C1 idiomatic neutral

To undergo the formal sterile hand and arm washing procedure required before participating in a surgical operation

"The attending surgeon told the medical student she could scrub in for the appendectomy."

"You wanna scrub in? You can scrub in."

— Grey's Anatomy, Season 1 (ABC, 2005)
Grammar: inseparable
2 C1 idiomatic informal

(Informal extension) To join a team or activity after completing the required preparation, borrowed from the medical sense

"The new technician finally scrubbed in on the lab project after finishing his safety certification."

Grammar: inseparable
Usage notes

Primarily a medical/surgical term used by doctors, nurses, and surgical staff. Well known to the general public largely through medical TV dramas. Almost exclusively used in a hospital or operating theatre context.

Commonly used with

surgeon nurse theatre operating room procedure surgery

Forms

Base
scrub in
I/you/we/they
3rd person
scrubs in
he/she/it
Past simple
scrubed in
yesterday
Past participle
scrubed in
have + pp
-ing form
scrubing in
continuous

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Synonyms

scrub up prepare for surgery sterilise hands

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