like: 一问三不知 → →
一问三不知 [yi1 wen4 san1 bu4 zhi1] ☊ 
fig. absolutely no idea of what's going on ☊ 
(engl: replying 'I don't know' to every question) (S) ☊ 一问三不知 [yi1 wen4 san1 bu4 zhi1] ☊ fig. absolutely no idea of what's going on ☊ (engl: replying 'I don't know' to every question) (S) ☊