FREEWHEEL
freewheel
(noun) a clutch (as on the rear wheel of a bicycle) that allows wheels to turn freely (as in coasting)
freewheel
(verb) coast in a vehicle using the freewheel
freewheel, drift
(verb) live unhurriedly, irresponsibly, or freely; “My son drifted around for years in California before going to law school”
Source: WordNet® 3.1
Etymology
Noun
freewheel (plural freewheels)
a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft.
Verb
freewheel (third-person singular simple present freewheels, present participle freewheeling, simple past and past participle freewheeled)
(of a gear) To continue spinning after disengagement.
(of a cyclist) To ride a bicycle without pedalling, e.g. downhill.
(of a motorist) To operate a motor vehicle which is coasting without power, e.g. downhill.
(by extension) To operate free from constraints.
Source: Wiktionary
Free"wheel`, n. (Mach.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition