There are 2 main definitions of let down in English:

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let down 1

(Of an aircraft or a pilot) descend prior to making a landing: over the harbour, I started to let down
More example sentences
  • Within the hour, we were letting down for a landing at Casablanca on the Atlantic coast of Morocco.
  • It was a beautiful sunny afternoon and I was letting down over the Adriatic heading southward.
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Definition of let down in:

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There are 2 main definitions of let down in English:

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let-down 2 Line breaks: let-down

noun

1A disappointment: the election was a bit of a let-down
More example sentences
  • I think the team should be cautious of a let-down after such a disappointing seeding.
  • It's like having a conjuring trick explained, interesting and a bit of a let-down: there is no magic, you find, only great skill and infinite care.
  • It was a bit of a let-down that the game on the Saturday was called off because I was really up for that, but they have promised to watch me at the start of next season.
Synonyms
2 [mass noun] The release of milk in a nursing mother or lactating animal as a reflex response to suckling or massage: in order to aid let-down do not feed at this time
More example sentences
  • When the baby touches the breast a hormone called oxytocin is released, beginning a process known as milk let-down or ejection reflex.
  • It is known that oxytocin is important for milk let-down, but its physiologic release is pulsatile in nature.
3 Aeronautics The descent of an aircraft or spacecraft prior to landing: you might well commence a let-down miles away
More example sentences
  • The rest of the flight, except for the extremely gentle let-down, was normal.

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