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Definition of let down phrasal verb from the Oxford Advanced Learner's Dictionary

let down

phrasal verb
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let somebody down
  1. to fail to help or support somebody as they had hoped or expected
    • I'm afraid she let us down badly.
    • This machine won't let you down.
    • He trudged home feeling lonely and let down.
    related noun let-downTopics Difficulty and failureb2
let somebody/something down
  1. to make somebody/something less successful than they/it should be
    • She speaks French very fluently, but her pronunciation lets her down.
    Topics Difficulty and failurec1
let something down
  1. to let or make something go down
    • We let the bucket down by a rope.
  2. to make a dress, skirt, coat, etc. longer, by reducing the amount of material that is folded over at the bottom
    • This skirt needs letting down.
    opposite take something up, take something up
  3. (British English) to allow the air to escape from something deliberately
    • Some kids had let my tyres down.
See let down in the Oxford Advanced American Dictionary
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