Dictionary entry

Swap (2)

Webster's Dictionary 1913

Swap, v. i. [Cf. Swap, v. t.] 1. To fall or descend; to rush hastily or violently. C. Richardson (Dict.).

All suddenly she swapt adown to ground. Chaucer.

2. To beat the air, or ply the wings, with a sweeping motion or noise; to flap.