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

 

heartstrings

 noun
noun
BrE BrE//ˈhɑːtstrɪŋz//
 
; NAmE NAmE//ˈhɑːrtstrɪŋz//
 
[plural] Romance, Love
 
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strong feelings of love or pity to tug/pull at somebody’s heartstrings (= to cause such feelings in somebody) See related entries: Romance, Love
See the Oxford Advanced American Dictionary entry: heartstrings