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English definition of “let sth down”

let sth down

(AIR) UK phrasal verb with let     /let/ verb (present participle letting, past tense and past participle let)
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 (AIR) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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