Idiom 181: think up

새로운 계획을 생각해 내거나 발명하다라고 할 때 사용하는 표현입니다.

think up = invent = create

The theme for this year's party will not work. We need to think up a new idea.

Idiom 180: pitch in

pitch in = help

Everyone needs to pitch in so that we can get the work done and go home.