Webster's English Dictionary

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clap

1. clap \'klap\ vb or clapped also clapt;  also clap.ping [ME clappen, fr. 
   OE clppan; akin to OHG klapho-n]to beat, L gle-ba clod - more at CLIP 
   1: to strike together (as two flat hard surfaces) so as to produce a sharp  
   percussive noise 2a: to strike (the hands) together repeatedly usu. in 
   applause  2b: APPLAUD  3: to strike with the flat of the hand in a friendly 
   way  4: to put or apply energetically  5: to improvise hastily  1: to 
   produce a percussive sound; esp : SLAM  2: to go abruptly or briskly  3: 
   APPLAUD 
2. clap n 1: a device that makes a clapping noise  obs  2: a sudden stroke 
   of fortune and esp. ill fortune  3: a loud percussive noise; specif : a 
   sudden crash of thunder  4a: a sudden blow  4b: a friendly slap  5: the 
   sound of clapping hands; esp : APPLAUSE 
3. clap n [MF clapoir bubo] : GONORRHEA