123 Chinese Idioms (成语), 100 from the Singapore Primary School Curriculum List—more soon!
méng zài gǔ lǐ
Literal Meaning 字面意思
Kept inside a drum
To be deceived and kept ignorant of matters by others
Similar English Idioms 相似英文习语
Kept in the dark; bamboozled; hoodwinked; conned
这两个孩子试图把妈妈蒙在鼓里，不让她知道他们考差的成绩，不料他们一进门就被发现了。 The two kids thought they could keep their mom in the dark about their horrible grades, but they got busted as soon as they stepped through the door.