Webster
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Webster’s Revised Unabridged Dictionary · 1913

Flap

Flap, n. [OE. flappe, flap, blow, bly-flap; cf. D. flap, and E. flap, v.] 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. pl. (Far.) A disease in the lips of horses.

Flap tile, a tile with a bent up portion, to turn a corner or catch a drip. — Flap valve (Mech.), a valve which opens and shuts upon one hinged side; a clack valve.

Flap, v. t. [imp. & p. p. Flapped; p. pr. & vb. n. Flapping.] [Prob. of imitative origin; cf. D. flappen, E. flap, n., flop, flippant, fillip.] 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.

To flap in the mouth, to taunt. [Obs.] W. Cartwright.

Flap, v. i. 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. Gay.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.