Noun letting down has 1 sense
  1. lowering, letting down - the act of causing something to move to a lower level
    --1 is a kind of movement
,Verb let down has 2 senses
  1. lower, take down, let down, get down, bring down - move something or somebody to a lower position; "take down the vase from the shelf"
    --1 is one way to move, displace
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Somebody ----s somebody PP
    Somebody ----s something PP
  2. disappoint, let down - fail to meet the hopes or expectations of; "Her boyfriend let her down when he did not propose marriage"
    --2 is one way to thwart, queer, spoil, scotch, foil, cross, frustrate, baffle, bilk
    Derived form: noun letdown1
    Sample sentence:
    The performance is likely to let down Sue
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