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English definition of “let sth down”

let sth down

verb uk phrasal verb with let   /let/ (present participle letting, past tense and past participle let) us  

(CLOTHES)

If you let down a piece of clothing, you make it longer: My trousers shrank in the wash so I let them down.Knitting and sewing

(AIR)

UK If you let down something filled with air, you cause the air to go out of it: Someone let my tyres down while I was at the gym.Becoming and making smaller or lessBecoming and making less strongRemoving and extracting
(Definition of let sth down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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