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English definition of “sweetheart”

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noun [C]  /ˈswitˌhɑrt/ ( infml sweetie,  /ˈswit̬·i/) us  
a person you love, esp. one with whom you have a romantic relationship: Jeanne was my high school sweetheart. Hi, sweetheart. A sweetheart is also a kind, generous person: She’s a sweetheart.
(Definition of sweetheart from the Cambridge Academic Content Dictionary © Cambridge University Press)
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