the gears by which the motion of a machine can be reversed
change to the contrary
turn inside out or upside down
the gears by which the motion of a machine can be reversed
a relation of direct opposition
set the level or character of
a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)
