Definition of "Gear" :

noun: a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

noun: equipment consisting of miscellaneous articles needed for a particular operation or sport etc.

noun: a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)

noun: wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed

"The fool got his tie caught in the geartrain."

verb: set the level or character of