嘘うそ寝ね

noun, noun or participle which takes 'suru'

feigned sleep; playing possum

Pretending to be asleep, often to avoid an awkward situation or to deceive someone. Commonly used with する.

• 母ははが部屋へやに入はいってきたので、急きゅうにうそ寝ねをした。

  When my mother came into the room, I quickly pretended to be asleep.