noun
plural flaps
[count] a flat piece of material that is attached to something on one side and that can be easily moved
the movement or sound of something that is moving up and down or back and forth
informal
a state or situation in which many people are excited or upset
b chiefly Brit :a state in which someone is very upset
a movable part of an airplane wing that can be raised or lowered and that is used to increase lift
verb
flaps; flapped; flapping
to move (something) up and down or back and forth [+ obj]