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Noun: heartburning  'haa(r)t,bur-ning
Usage: archaic
  1. Intense resentment
    "his promotion caused much heartburning among his rivals"

Derived forms: heartburnings

Type of: acrimoniousness, bile, bitterness, gall, hard feelings, ill feeling, rancor [US], rancour [Brit, Cdn], resentment