lit. grass stirring in the wind (idiom); fig. the slightest whiff of t
风 · 4 strokes
Simplified form of 風. Originally written the same as 鳳 (phoenix) because the two characters sounded the same. Later the bottom part of the character was abbreviated to distinguish the two characters.
吹 · 7 strokes
Depicts blowing out air (欠) with the mouth (口).
草 · 9 strokes
Phonosemantic compound. 艹 represents the meaning and 早 represents the sound.
动 · 6 strokes
Simplified form of 動. Phonosemantic compound. 力 represents the meaning. The sound component 重 was simplified to 云.
一有风吹草动，他就紧张得不得了。
At the slightest sign of trouble, he gets extremely nervous.