Meaning of “be all heart” in the English Dictionary

british dictionary

"be all heart" in British English

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be all heart

to be very kind and generous. This phrase is often used humorously, especially in the UK, to mean the opposite:

She's all heart.
humorous "He deserves all he gets." "Oh, you're all heart (= you are not kind)!"

(Definition of “be all heart” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)