ter mais olhos que barriga

idiomatic

自分の能力以上のことをしようとする / 実際に必要な以上に欲しがる／求める

English Meaning

(idiomatic) to attempt to do more than one is capable of doing

Na feira, ele tentou ter mais olhos que barriga ao comprar tanta comida, mas acabou a desperdiçando.

市場で、彼はあまりにも多くの食べ物を買い込み、身の丈に合わない欲張りをした結果、結局全てを無駄にしてしまった。

At the market, he tried to bite off more than he could chew by buying so much food, but ended up wasting it.