duvet day
noun [ C ] UK informal uk/ˈduː.veɪ ˌdeɪ/ us/duː.ˈveɪ ˌdeɪ/
（因为需要休息而非生病的）羽绒被拥卧日，偷闲日
a day off work, not because you are ill but because you need some time to rest
The company is one of many who now offer two duvet days a year, for when employees just can't face getting out of bed. 和其他许多公司一样，这家公司每年提供两天的偷闲假日，不想起床工作的雇员可以选择休假。