Flap — Defs

01 n. Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment.

1.
Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment.
“A cartilaginous flap upon the opening of the larynx.” — Sir T. Browne.
2.
A hinged leaf, as of a table or shutter.
3.
The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or of a wing.
4.
A disease in the lips of horses.(Far.)
5.
a movable part of an airplane wing, used to increase lift or drag, especially when taking off or landing. used often in the plural.(Aeronautics)

Phrases & compounds

Flap tile — a tile with a bent up portion, to turn a corner or catch a drip.

Flap valve — a valve which opens and shuts upon one hinged side; a clack valve.

02 v. t. To beat with a flap; to strike.

imp. & p. p. Flapped; p. pr. & vb. n. Flapping

1.
To beat with a flap; to strike.
“Yet let me flap this bug with gilded wings.” — Pope.
2.
To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat.

Phrases & compounds

To flap in the mouth — to taunt.

03 v. i. To move as do wings, or as something broad or loose; to fly with wings beating the air.

1.
To move as do wings, or as something broad or loose; to fly with wings beating the air.
“The crows flapped over by twos and threes.” — Lowell.
2.
To fall and hang like a flap, as the brim of a hat, or other broad thing.