have-eyes-bigger-than-one-s-belly

Verb

(third-person singular simple present has eyes bigger than one's belly, present participle having eyes bigger than one's belly, simple past and past participle had eyes bigger than one's belly)

(idiomatic, UK, uncommon) To take more food on one's plate than one can eat; to be greedy.
His eyes are bigger than his belly.
Your eyes are bigger than your belly.

English Wiktionary. Available under CC-BY-SA license.