眼大肚子小

yǎndàduzìxiǎo
  1. (idiomatic) to have eyes bigger than one's stomach; to take more food than one can eat
  2. to have eyes bigger than one's stomach; to take more food than one can eat

Wiktionary

Entry Composition

1 眼 yǎn
  1. (often used with 一 yī) a look; a glance
  2. small hole
  3. (bound form) salient point
  4. classifier for wells, cave-dwellings etc

classifiers: 隻, 雙
2 大肚子 dàdùzi
  1. pregnant
  2. potbelly
  3. big eater
3 小 xiǎo
  1. small
  2. tiny
  3. few
  4. young