let down (2)

Meaning: to release the air from something like a tyre or a blow-up mattress

Synonym: deflate

For example:

let down sth Timothy was expelled from school for letting down the tyres on his teacher's car.
let sth down After they'd played with their blow-up dolls, they let them down and packed them away.

Variety: This is typically used in British and Australian English but may be used in other varieties of English too.

Quick Quiz:

Letting the mattress down was much easier than

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