Cut a number (5)
I believe the answer is:
score
I believe this is a double definition.
'cut' is the first definition.
(I know that score is a more specific form of the action notch)
'a number' is the second definition.
(I know that score is a type of number)
(Other definitions for score that I've seen before include "Deeply scratch" , "Points in a match" , "Gain a point (20 of them?)" , "Orchestrate; twenty" , "Musical composition in written form" .)