jackman noun3 •A member of the pit crew responsible for lifting the car with a jack.While Stewart’s team checked out the damage to his car in the pit stall, Busch pulled next to Stewart’s car, forcing the jackman Jason Lee to jump back and onto the hood. — 2007 •A six-pointed playing piece in the game of jacks; a jackstone. •(no longer used) One wearing a jack; a horse soldier; a retainer.Christie […] the laird's chief jackman. — 1820 formsjackmen