to exert all one's strength

shǐ jìn

sh+ǐ·3rd tonej+ìn·4th tone

Examples2 available

I think that, in tough times, you can cry as much as you want.

我想, 在艰难的时候, 你想哭就使劲哭吧。

The woodpecker is pecking the tree trunk vigorously.

啄木鸟正在使劲地啄树干。