(klap) v. clapped or clapt, clap·ping v.t.
1. To strike together with a sharp, explosive sound.
2. To applaud by clapping the hands.
3. To strike suddenly, as in greeting.
4. To place quickly or suddenly.
5. To make or build hastily: often with together or up.
6. To flap, as wings.
7. Obs. To shut, as a door or window.
—v.i.
8. To come together with a sharp, explosive sound, as flat surfaces.
9. To applaud by striking the hands together.
10. Archaic To close with a clapping sound.
—to clap eyes on To see.
—noun
1. A sharp sudden noise, as of two hard flat objects coming together.
2. The act of striking sharply together flatwise: a clap of the hands.
3. A sudden, but slight blow with the flat of the hand; a slap.
4. Obs. A sudden stroke or event. [OE clæppan]

(klap) noun
Gonorrhea: usually with the a vulgarism. [<OF clapoir a venereal sore]