一问三不知

[yī wèn sān bù zhī]

na.deny all knowledge of an event
网络be entirely ignorant; complete ignorance; to keep one's mouth tightly shut

汉英

网络释义

na.	1. deny all knowledge of an event; be entirely ignorant; not knowing a thing; shake one's head in answer to all quesions; say "I don't know" to every question