klaff

Etymology
Probably related to, itself borrowed from , from , from.

Noun

 * 1) a leaf (flat section used to extend a table)
 * 2) a leaf (of a bascule bridge)
 * 3) a key (on a wind instrument)
 * 4) a valve (of a heart)
 * 5) a mouth (rude; used in the expression )