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Wiktionary
have eyes bigger than one's stomach

alt. 1 (context idiomatic English) To take more food on one's plate than one can eat; to be greedy. 2 (context idiomatic English) To want more than one can handle. vb. 1 (context idiomatic English) To take more food on one's plate than one can eat; to be greedy. 2 (context idiomatic English) To want more than one can handle.