惊慌失措 jīnghuāng-shīcuò to lose one's head out of fear (idiom)

怎么记住“惊慌失措”: 惊 frighten + 慌 frantic + 失 to lose + 措 to arrange = to lose one's head out of fear (idiom).

汉字

Idiom: to panic and not know what to do, losing all composure - 突发事件让她惊慌失措 (tūfā shìjiàn ràng tā jīnghuāng-shīcuò) the emergency threw her into a flustered panic.
失措 = at a loss for what to do; the key is the paralysis/floundering that fear causes.
Contrast 镇定自若 (zhèndìng zìruò), staying perfectly calm - the exact opposite behavior.