From Longman Dictionary of Contemporary Englishnot cut itnot cut itinformal to not be good enough to do something Players who can’t cut it soon quit the team. → cut
Examples from the Corpus
not cut it• Most of the kids who start here are young and haven't worked before. Some just can't cut it.• Players who can't cut it soon realize it and quit.• We could make a lot of excuses, but excuses won't cut it.• So why not cut it down like they do?• Lightly trim the grass using a sharp mower if the surface is looking rough, but do not cut it short. 