Definition
to retire for the night
去上床睡觉
I’m really tired tonight, so I plan to sack out early.
我今晚真的很累，所以我打算早点上床睡觉。
He works late every day and then just sacks out.
他每天都工作到很晚，然后就直接去睡觉了。
After watching the movie, we all felt sleepy, so we decided to sack out.
看完电影后，我们都觉得很困，所以决定去睡觉。