Dic: bring to a head, come to a head

• The latest disagreement between management and the union has brought matters to a head. 
• There will be an all-out strike now. It's a relief that things have been brought to a head. The disputes have been going on for months.

bring something to a head: to cause something to come to the point when a decision has to be made or action taken.

.... McGraw-Hill Idioms

if you (bring) a situation (to a head) or if a situation (comes to a head), you are forced to deal with it quickly because it suddenly becomes very bad.

.... OALD