From Longman Dictionary of Contemporary Englishnot cut the mustardnot cut the mustardGOOD ENOUGH informal to not be good enough Other magazines have tried to copy the formula but have never quite cut the mustard. → cut
Examples from the Corpus
not cut the mustard• Athletes who can't cut the mustard don't make the team.• When a director reaches a certain age, he just can't cut the mustard anymore. 