吃功夫

吃功夫

Literally means:

eat Kung Fu

Actually means:

entail much effort; be strenuous

It refers to some work that requires great efforts or strong ability. It is often used to describe something difficult or time-consuming.

指做某事要耗费精力，需要较深的功力。多涉及难度大、要求高、时间长的事情。