let·down
ˈlet-ˌdau̇n
1
a
: discouragement, disappointment
his latest novel is a letdown
b
: a slackening of effort : relaxation
2
: the descent of an aircraft or spacecraft to the point at which a landing approach is begun
3
: a physiological response of a lactating mammal to suckling and allied stimuli whereby previously secreted milk from the acini is expelled into ducts and drawn through the nipple
let down; letting down; lets down
1
: to allow to descend gradually
2
a
: to fail to support
felt her parents had let her down
b
: disappoint
the plot lets you down at the end
afraid of letting his father down
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Merriam-Webster unabridged
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