Definition of heartburn noun from the Oxford Advanced Learner's Dictionary

 

heartburn

 noun
noun
BrE BrE//ˈhɑːtbɜːn//
 
; NAmE NAmE//ˈhɑːrtbɜːrn//
 
[uncountable]
 
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a pain that feels like something burning in your chest caused by indigestion
See the Oxford Advanced American Dictionary entry: heartburn