You let the small fish go to catch the big fish.
放长线钓大鱼.

an odd fish or a queer fish古怪的人

a cold fish不热情的人

a big fish in a lettle pond 小地方的要人

neither fish nor fowl不伦不类

You let the small fish go to  catch the big fish.
Feel like a fish in water.

An odd fish or a queer fish.
A cold tish
Neither fish nor fowl.

let the small fish go to catch a big fish

You let the small fish go to catch the big fish.
放长线钓大鱼.
呵呵,中文的说法更丰富!

You let the small fish go to catch the big fish.

You let the small fish go to catch the big fish
you let the small fish go to catch the big fish