a small cut, notch, or groove
the point at which the back or side wall of a squash court meets the floor
a line where two planes meet; = edge1 (2)
(the nick) Brit, informal a prison or police station
in good/bad nick
Brit, informal in good or bad condition
in the nick of time
at the final critical moment; just before it would be too late
[Middle English nyke, prob alteration of nocke nock1]