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heartburn

noun [U]
 
 
/ˈhɑːt.bɜːn/ US  /ˈhɑːrt.bɝːn/

Definition

a painful burning feeling in the lower chest caused by the stomach not digesting food correctlyDigestive disorders
(Definition of heartburn noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of heartburn