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swamp out

B2 informal separable transitive
In simple words

To give a dirty, wet, or messy place a really thorough cleaning, usually with water.

Literal meaning: To clean something out as if washing out a swamp.

Meanings

1 B2 informal

To clean out an enclosed space, especially a vehicle or animal stall, by washing and scrubbing it thoroughly.

"After the flood, the volunteers spent all day swamping out the ground floor of the community centre."

Grammar: separable
2 B2 neutral

In military or outdoor contexts, to clean and clear out a tent, vehicle, or temporary shelter.

"The sergeant ordered the recruits to swamp out the barracks before lights out."

Grammar: separable
Usage notes

Used especially in military (cleaning out vehicles or billets), nautical, and rural/farming contexts. Less common in everyday domestic use. Can also occasionally mean to overwhelm someone with too much work, though 'swamp' alone is used more often for this.

Commonly used with

boat truck stable bilge enclosure vehicle

Forms

Base
swamp out
I/you/we/they
3rd person
swamps out
he/she/it
Past simple
swamped out
yesterday
Past participle
swamped out
have + pp
-ing form
swamping out
continuous

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