阎王

huó yán wang

活阎王

living King of Hell

yán wang bù zài xiǎo guǐ tiào liáng

阎王不在，小鬼跳梁。

When the cat is away, the mice will play.

jiàn yán wang

见阎王

kick the bucket

jiē jí de yán wang

阶级的阎王

terror of class