一动

tā yī dòng jiù fā pí qi

她一动就发脾气。

She loses her temper easily.

yī dòng jiù kū

一动就哭

weep easily

yī dòng bù xǔ dòng fǒu zé tā jiù yào kāi qiāng le

一动不许动，否则他就要开枪了！

Don't make a move or he'll shoot!

shǒu de yī dòng

手的一动

a movement of the hand

zhè yī dòng shǐ tā lěng bù fang de xiàng qián shuāi dǎo

这一动使她冷不防地向前摔倒。

The movement took her by surprise, and she pitched forward.