A blow, especially one given with the open hand, or with something broad and flat.
He gave me a friendly slap on the back as a sign of camaraderie.
A sharp percussive sound like that produced by such a blow.
the slap of my feet on the bathroom tiles
To strike someone, typically with an open hand, often on the face.
She slapped him in response to the insult.
To cause something to strike soundly.
From Middle English slappen, of uncertain origin, possibly imitative. Compare Low German Slappe (“slap”), whence also German Schlappe (“defeat”). Compare also Italian sleppa (“slap”).
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He slapped the reins against the horse's back.
To strike soundly against something.
The rain slapped against the window-panes.