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Verb: boil over  boyl ow-vu(r)
  1. Overflow or cause to overflow while boiling
    "The milk is boiling over";
    - overboil
     
  2. (of emotions or a situation) become so intense as to get out of control
    "Tensions boiled over into violence"

Derived forms: boils over, boiling over, boiled over

Type of: boil