hired gun
US /ˈhaɪərd ˌɡʌn/
UK /ˈhaɪərd ˌɡʌn/

1.
sicario, mercenario, pistolero a sueldo
a person whose services can be bought, especially a mercenary or assassin
:
•
The company brought in a hired gun to deal with their legal troubles.
La empresa contrató a un sicario para lidiar con sus problemas legales.
•
He was known as a hired gun, always ready to take on dangerous assignments for a price.
Era conocido como un sicario, siempre dispuesto a asumir misiones peligrosas por un precio.