The tap (of a pair) that produces hot water (the other being the cold tap)

The tap (of a pair) that produces cold water (the other being the hot tap)

A tap or a slap on a device in a way to either make it work correctly again, or break it completely. For example, hitting a TV to get its reception back, or hitting a jukebox back to life.

(medicine, colloquial) Lumbar puncture (LP).

Water that has come from a tap. / State of having water available from taps.

(dance) Someone who performs a tap dance.

To perform a tap dance

A rhythmic dance in which the heels and toes of the dancer's shoes make a series of clicks

(idiomatic) A tactical shooting technique of pulling the trigger of a weapon twice in quick succession to deliver two shots to the same target zone. / Two shots or bullets such fired.

To shoot twice. / To click twice on a touchscreen.