草木皆兵　

◎ 草木皆兵 cǎomù-jiēbīng

[every bush and tree looks like an enemy—a state of extreme nervousness,as if surrounded by enemies;apprehend danger in every sound] 《晋书·苻坚载记》:淝水之战,苻坚看到 东晋军队阵容严整,又远望八公山,把山上的草木都当成晋军,十分恐惧。后用以比喻惊慌失措、猜忌敏感的心态