Sharp knock on a door (3)
I believe the answer is:
rap
(Other definitions for rap that I've seen before include "Knock, tap" , "Sharply strike; rebuke" , "Knock for par" , "Sharp blow; criticism" , "Knock; type of rhythmical speech to music" .)
I believe the answer is:
rap
(Other definitions for rap that I've seen before include "Knock, tap" , "Sharply strike; rebuke" , "Knock for par" , "Sharp blow; criticism" , "Knock; type of rhythmical speech to music" .)