大魚吃小魚

大鱼吃小鱼
dàyúchīxiǎoyú

ellipsis of 大魚吃小魚，小魚吃蝦米 /大鱼吃小鱼，小鱼吃虾米 (dàyú chī xiǎoyú, xiǎoyú chī xiāmi)

Wiktionary

Entry Composition

1 大魚 dàyú
  1. (figurative) a valuable person or thing that is being searched for
  2. Used other than figuratively or idiomatically: see 大, 魚 /鱼 (yú). ("big fish")
  3. a valuable person or thing that is being searched for
=2 吃 chī
  1. to eat; to consume
  2. to eat at (a cafeteria etc)
  3. to eradicate; to destroy
  4. to absorb
  5. to suffer (shock, injury, defeat etc)
=2 吃 chī variant of 吃 chī
3 小魚 xiǎoyú small fish