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The Collaborative International Dictionary of English v.0.48 (gcide)

Tap \Tap\, v. t. [imp. & p. p. {Tapped}; p. pr. & vb. n.
{Tapping}.] [F. taper to strike; of Teutonic origin; cf.
dial. G. tapp, tapps, a blow, tappe a paw, fist, G. tappen to
grope.]
1. To strike with a slight or gentle blow; to touch gently;
to rap lightly; to pat; as, to tap one with the hand or a
cane.
[1913 Webster]

2. To put a new sole or heel on; as, to tap shoes.
[1913 Webster]