come to a head
(also bring something to a head) if a problem or difficult situation comes to a head, or something brings it to a head, it suddenly becomes worse and has to be dealt with quickly

[TahlilGaran] Dictionary of Contemporary English ▲

come to a head
if a problem or a disagreement comes to a head, it becomes so bad that you have to start dealing with it.
Things hadn't been good between them for a while but it all came to a head last week when Phil failed to come home one night.

[TahlilGaran] English Idioms Dictionary ▲

come to a head
to come to a point where a problem must be solved
The issue came to a head and everyone was forced to talk about the problem.

[TahlilGaran] English Idioms Dictionary ▲