不知所措
bù zhī suǒ cuò
at a loss
Character by character
不bù
not
not
知zhī
know
know
所suǒ
what
what
措cuò
to do
to do
Example
突然被老师提问，他不知所措。
Suddenly called on by the teacher, he didn't know what to do.
Tone: neutral.
Usage and origin
Often after 让人 or 一时; 措 means 'to handle'.
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