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不
bu4
不
知
zhi1
知
所
suo3
所
云
yun2
云
to not know what sb is driving at
to be unintelligible
Info
Wiktionary: 不知所云
MDBG: 不知所云
Examples with 不知所云 on
Tatoeba
Percentile: 38
(higher is more common)
Tags:
chengyu