- a lesser or minor boss, often the second in command, as in an underworld hierarchy.
Origin of underboss
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for underboss
Zerilli reportedly held the rank as capo, or captain, when he came out, though he is said by some to have served as underboss.Meet Tony Zerilli, the Mobster Behind This Jimmy Hoffa Dig
June 19, 2013