ㄅㄧˋㄇㄨˋㄙㄜˋㄊㄧㄥtīng

  1. 閉上眼睛耳朵比喻一個外界事物全然斷絕大學決定閉目塞聽專心唸書。」廣開言路

to shut one's eyes and stop one's ears, out of touch with reality, to bury one's head in the sand