(obsolete) To fall or descend; to rush hastily or violently.
(obsolete) To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
Esimerkit
How much swap do you need?
The Shah wanted to swap oil for more arms.
Chief watched these goings-on without pleasure, and waved them off in disgust when the smarmiest of the two suggested he might wish to swap that elk's tooth for this jug of fine rye whiskey.
In an effort to provide more permanent accommodations, employers may offer employees the opportunity either to swap jobs with a colleague or to transfer to a new position.
And soo sir launcelot rode on the one syde and she on the other / he had not ryden but a whyle / but the knyghte badde sir Launcelot torne hym and loke behynde hym /[...]/ And soo sir launcelot torned hym[...]/ and there wyth was the knyghte and the lady on one syde / & sodenly he swapped of his ladyes hede