sweetheart

Pronunciation: /ˈswiːtˌhɑːt/

The English word “sweetheart” has 4 meanings listed here.

noun

A person who is always very kind.
A person very much liked or loved by someone, especially when both partners are young.
A term of endearment, especially for a lover or child.
A female member of a college or university fraternity.

From Middle English swete heorte, swete hert (term of endearment); equivalent to sweet + heart.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.