Of the wind: To blow in gusts. Of a cloth: To flap in the wind. Of wings: To flap, beat. Obsolete.

intransitive. To flap, make a flapping; to flutter. Of the lungs or heart: To pant or throb.

intransitive. Of anything attached at one extremity or loosely fastened: To swing or sway about loosely; to flutter or oscillate as when moved by…

intransitive. To swing or sway about heavily and loosely; = flap, v. 5.

intransitive. To flap about (as a fish); to flutter (as a bird); to flounder.

intransitive. To go about with flapping garments. Of garments, etc., to flap, flutter (in the wind).

To dangle, flap, ‘flop about’, wobble. colloquial and dialect (esp. Scottish).

intransitive. To flap about.

(intransitive) to move like a flapper, i.e. with a loose flapping motion.

To flap or beat up and down: also with it.

In other contexts: To flap or slap.

Of a sail: to flap idly in the wind.