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. [ Webster 1913 Suppl. ]
v. i.
n. Someone acting freely or even irresponsibly.
adj. Acting heedless of consequences; acting without controls, external or internal;