come to a head

/K AH1 M T UW0 AH0 EH0 D/
verb
  1. 1

    To rapidly reach a turning point or climax.

    โ€œThe escalating crisis between England and her American colonies came to a head when fighting broke out in 1775.โ€

  2. 2

    To suddenly reveal that which has lain latent for a time.

    โ€œHis festering anger came to a head after the incident.โ€

  3. 3

    To suddenly make mature or perfected that which was inchoate or imperfectly formed.

  4. 4

    (of an abscess) To reach its final stage.

Source: https://en.wiktionary.org/wiki/come%20to%20a%20head