turn in

US /tɜːrn ɪn/
UK /tɜːrn ɪn/
"turn in" picture
1.

睡觉, 就寝

to go to bed

:
It's getting late, I think I'll turn in.
天色已晚,我想我该睡觉了。
He usually turns in around 10 PM.
他通常在晚上10点左右睡觉
2.

上交, 提交, 自首

to hand over or submit something, especially to an authority

:
Please turn in your assignments by Friday.
请在周五前上交你的作业。
The suspect decided to turn himself in to the police.
嫌疑人决定向警方自首