can't cut it

PHRASE

If you say that someone can't cut it, you mean that they do not have the qualities needed to do a task or cope with a situation.

And this was a typical example of how to use this particular phrase “doesn’t cut it.” It simply means, it’s not enough. Whatever you were mentioning previously in your conversation is not going to be enough to achieve the desired results. And to put it simpler, it just won’t cut it.

That won't cut it' means something is not good enough. When talking about the amount of work someone is putting into an effort you might say 'Bob started studying for the test yesterday. That just won't cut it'.