Noun
(basketball) A player who is not a starter but comes off the bench much more often than other reserves.
By extension, a person or group who is not part of a team, but who supports or contributes to the success of the team.
Source: en.wiktionary.orgFinally, under which of the old tyrannical governments of Europe is every sixth man a slave, whom his fellow-creatures may buy and sell and torture? Sydney Smith
Harrell has been a key member of the Clippers' bench this season and is a contender for the NBA's Sixth Man of the Year Award. Source: Internet
Last week, the Clippers’ reserve center Montrezl Harrell was awarded the Sixth Man of the Year award for the first time, marking the fifth time in seven seasons a Clipper has won that award. Source: Internet
Teammate Karson Parker was named as the Sixth Man of the Year. Source: Internet