To strike with something small, or to strike a very gentle blow; to touch gently; as, to tap one with the hand; to tap one on the shoulder with a cane.

To strike a gentle blow. He tapped at the door.

To pierce or broach a cask, and insert a tap.

To open a cask and draw liquor.

To pierce for letting out a fluid; as, to tap a tumor; to tap a dropsical person.

To box, or bore into; as, to tap a maple tree to obtain the sap for making sugar.

A gentle blow; a slight blow with a small thing. She gives her right hand woman a tap on the shoulder.

A spile or pipe for drawing liquor from a cask.