\Free"wheel`\, n. (Mach.)
A clutch fitted in the rear hub of a cycle, which engages the
rear sprocket with the rear wheel when the pedals are rotated
forwards, but permits the rear wheel to run on free from the
rear sprocket when the pedals are stopped or rotated
backwards. Freewheelcycles are usually fitted with hub brakes
or rim brakes, operated by back pedaling.

\Free"wheel`\, v. i.
1.
   (a) Of a freewheel cycle, to run on while the pedals are
       held still.
   (b) Of a person, to ride a cycle of this manner. To ride a
       freewheel cycle.
2. (Mach.) To operate like a freewheel, so that one part
   moves freely over another which normally moves with it; --
   said of a clutch.