ˈjakə(r) noun
( -s )
: one that jacks: as
a. : a person who hunts or fishes at night with a jacklight
b. : a worker who smooths and toughens leather by rolling it under pressure in a rolling jack
c.
(1) : a sawmill pondman who guides logs into the jack chain that moves them to the log deck of the mill — called also jackerman, slipman
(2) : jack chain