How do you spell Swap

Available Definitions:
1)  v. i. - To strike; -- with off.
2)  v. i. - To exchange (usually two things of the same kind); to swop.
3)  v. t. - To fall or descend; to rush hastily or violently.
4)  v. t. - To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
5)  n. - A blow; a stroke.
6)  n. - An exchange; a barter.
7)  n. - Hastily.