老外常用'wing it'来表示做事即兴发挥，临场发挥。

I didn't prepare anything for my speech. I am gonna just wing it. 我没有给我的演讲做任何准备。我到时临场发挥就是啦。

He gave a performance by winging it. 他给了个即兴发挥的表演。

I will just wing it. 我到时就临场发挥吧。