Definition of boil over phrasal verb from the Oxford Advanced American Dictionary

 

boil over

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1(of liquid) to boil and flow over the side of a pan, etc. The milk is boiling over.
  2. 2(informal) to become very angry
  3. 3(of a situation, an emotion, etc.) to change into something more dangerous or violent synonym explode Racial tension finally boiled over in the inner city riots.
See the Oxford Advanced Learner's Dictionary entry: boil over