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3. tap on

tap on

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tap on something

to make one or more light blows on something. Who is that tapping on my windowpane? I wish you would stop tapping on the tabletop.

See also: on, tap

tap someone or something on something

to make one or more light blows on some part of someone or something. Someone tapped me on the shoulder, and I turned around to see who it was. I tapped the drum on the top to find its pitch.

See also: on, tap