Synonyms of 'eat your heart out'
▷ See heart
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If someone broods over something, they think about it a lot, seriously and often unhappily.
She constantly broods about her family.
If you grieve over something, especially someone's death, you feel very sad about it.
He's grieving over his dead wife and son.
If you mope, you feel miserable and do not feel interested in doing anything.
Get on with life; don't sit back and mope.
Thesaurus for eat your heart out from the Collins English Thesaurus
People use eat your heart out with the name of a person when they are doing something that they think the person named might be jealous of.