1flap 
/ˈflæp/ noun
plural flaps /ˈflæp/ noun [count] 1 : a flat piece of material that is attached to something on one side and that can be easily moved
▪ She opened the tent flap and crawled outside. ▪ the inside flap of a book's cover ▪ a loose flap of skin 2 : the movement or sound of something that is moving up and down or back and forth
▪ the soft flap [=flapping] of the flag in the breeze ▪ the steady flap [=beat] of the bird's wings 3 informal a : a state or situation in which many people are excited or upset
▪ He was widely criticized during the recent flap [=uproar] about his controversial new book.
b chiefly Brit : a state in which someone is very upset
▪ He got in a flap [=he became upset] over the delays in the schedule. 4 : a movable part of an airplane wing that can be raised or lowered and that is used to increase lift
▪ She opened the tent flap and crawled outside. ▪ the inside flap of a book's cover ▪ a loose flap of skin
▪ the soft flap [=flapping] of the flag in the breeze ▪ the steady flap [=beat] of the bird's wings
▪ He was widely criticized during the recent flap [=uproar] about his controversial new book.
b chiefly Brit : a state in which someone is very upset
▪ He got in a flap [=he became upset] over the delays in the schedule.
