do in
US /duː ɪn/
UK /duː ɪn/

1.
matar, liquidar
to kill someone
:
•
The gangster threatened to do in anyone who betrayed him.
El gánster amenazó con liquidar a cualquiera que lo traicionara.
•
He was afraid the enemy would do him in if they caught him.
Temía que el enemigo lo matara si lo atrapaban.