To be caught off guard or unprepared for a sudden event.
措手着手处理。来不及动手应付。指事出意外，一时无法对付。
元·无名氏《千里独行》楔子咱今晚间，领着百十骑人马，偷营动寨，走一遭去，杀他个措手不及。”
The sudden rainstorm caught us off guard, and we got soaked.
Learn the next connected idiom: 措手不及 (cuò shǒu bù jí) → 及时行乐 (jí shí xíng lè)
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