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Webster 1828 Edition

ppr.

Broaching; opening for the discharge of a fluid.

tapping ‎(plural tappings)

An act of making a light hit or strike against something.
- 1897, Bram Stoker, Dracula Chapter 20
  As he was speaking there was a soft tapping at the door. I went over and opened it...
- 2009 June 26, Alastair Macaulay, “Leading the Audience Into Flamenco’s Heart”, in New York Times:
  She has rapid and powerful footwork, but she doesn’t wow you with any special trills or woodpecker tappings.
(music) A guitar technique in which the strings are tapped against the fingerboard

tapping