turn in
US /tɜːrn ɪn/
UK /tɜːrn ɪn/

1.
se coucher, aller au lit
to go to bed
:
•
It's getting late, I think I'll turn in.
Il se fait tard, je pense que je vais me coucher.
•
He usually turns in around 10 PM.
Il se couche généralement vers 22h.
2.
remettre, soumettre, se rendre
to hand over or submit something, especially to an authority
:
•
Please turn in your assignments by Friday.
Veuillez remettre vos devoirs avant vendredi.
•
The suspect decided to turn himself in to the police.
Le suspect a décidé de se rendre à la police.