Freewheel

[friː'wiːl] or [,fri'wil]

(noun.) a clutch (as on the rear wheel of a bicycle) that allows wheels to turn freely (as in coasting).

(verb.) coast in a vehicle using the freewheel.

(verb.) live unhurriedly, irresponsibly, or freely; 'My son drifted around for years in California before going to law school'.

以利沙整理--From WordNet