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English definition of “heartburn”

heartburn

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