come to a head

verb4

1. •
   To rapidly reach a turning point or climax.

   • The escalating crisis between England and her American colonies came to a head when fighting broke out in 1775.
2. •
   To reach its final stage.
3. •
   To suddenly reveal itself, having lain latent for a time.

   • His festering anger came to a head after the incident.
4. •
   To suddenly become mature or perfected, having been inchoate or imperfectly formed.