noun, noun or participle which takes 'suru', intransitive verb
feigning sleep; playing possum
Pretending to be asleep, often to avoid something or deceive someone. Can be used literally or figuratively.
弟は宿題をやりたくなくて、狸寝入りを決め込んだ。
My younger brother didn't want to do his homework, so he pretended to be asleep.
During the meeting, he feigned sleep to avoid speaking.