do in
US /duː ɪn/
UK /duː ɪn/

1.
matar, liquidar
to kill someone
:
•
The gangster threatened to do in anyone who betrayed him.
O gângster ameaçou matar qualquer um que o traísse.
•
He was afraid the enemy would do him in if they caught him.
Ele tinha medo que o inimigo o matasse se o pegassem.