We found one dictionary that defines the word eat one's heart:

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1. eat one's heart: Wiktionary

Definitions from Wiktionary (eat one's heart) ▸ verb:  Synonym of eat one's heart out ▸ Words similar to eat one's heart ▸ Usage examples for eat one's heart ▸ Idioms related to eat one's heart ▸ Wikipedia articles (New!) ▸ Words that often appear near eat one's heart ▸ Rhymes of eat one's heart ▸ Invented words related to eat one's heart