What does "underboss" mean?

An assistant to the boss of a crime family

What is a synonym for "underboss"?

Common synonyms include: deputy, lieutenant, second in command.

noun

noun ·Rare ·Advanced level

Noun

1
An assistant to the boss of a crime family
"An alleged "underboss" of the Bonanno family, Carmine Galante, has been sentenced to 20 years in prison […]"
2
an assistant or second-in-command to a chief (especially in a crime syndicate) wordnet

"An alleged "underboss" of the Bonanno family, Carmine Galante, has been sentenced to 20 years in prison […]"

From under- + boss, calque of the Italian sotto capo