Bring something to a head
Definition 1 of 2
Pro Tip 1/3Metaphorical Use
Used to describe situations, not physical objects, reaching a critical point. 
Disagreements among the team members finally brought the tensions to a head.
Pro Tip 2/3Implies Neglect
Suggests an issue has been ignored or avoided until it became critical. 
His avoidance brought the payment discrepancies to a head during the audit.
Pro Tip 3/3Resolution Trigger
Highlights the moment when action is taken to resolve a prolonged problem. 
The strike brought the company's unfair policies to a head, forcing reform.