Longman Dictionary of Contemporary English homepage

flap

1 noun
     
Related topics: Air
flap1
1

flat piece of something

[countable] a thin flat piece of cloth, paper, skin etc that is fixed by one edge to a surface, which you can lift up easily:
the tent flap
A loose flap of skin covered the wound.
cat flap
2

movement

[singular] the noisy movement of something such as cloth in the air:
the flap of the sails
3

excitement/worry

a flap

informal a situation in which people feel very excited or worried about something
be in a flap
Rafi's in a bit of a flap over the wedding plans.
unflappable
4

part of aircraft

[countable]TTA a part of the wing of an aircraft that can be raised or lowered to help the aircraft go up or down

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