boil over

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boil over (third-person singular simple present boils over, present participle boiling over, simple past and past participle boiled over)

1. (intransitive) To boil to such an extent as to overflow its container.

   I forgot about the rice and it boiled over.

2. (idiomatic, of anger, etc.) To reach the point where aggressive action is taken.
   • 1913, Joseph C[rosby] Lincoln, chapter XIII, in Mr. Pratt’s Patients, New York, N.Y., London: D[aniel] Appleton and Company, →OCLC:

     He b'iled right over, and the tongue-lashing he give that boss Right Liver beat anything I ever listened to. There was heap of Scriptur' language in it, and more brimstone than you'd find in a match factory.

   • 2013 September 1, Phil McNulty, Liverpool 1-0 Man Utd, via BBC Sport:

     But as the half progressed, Liverpool's pressure and high-tempo passing game increased United's frustration and it threatened to boil over on the stroke of half-time when Van Persie, who had already been booked, was involved in angry verbal exchanges with several Liverpool players, particularly Gerrard.

• overboil