to fly or move quickly and lightly

In the fading light we saw bats flitting around/about in the garden. 天色渐暗时，我们看到蝙蝠在花园里飞来飞去。

figurative She's always flitting from one thing to another (= changing her activities). 她总是一会儿做这个，一会儿做那个。

to appear or exist suddenly and for a short time in someone's mind or on their face

A ghost of a smile flitted across his face. 他脸上闪过一丝微笑。