a clutch (as on the rear wheel of a bicycle) that allows wheels to turn freely (as in coasting)
Verb
live unhurriedly, irresponsibly, or freely;
"My son drifted around for years in California before going to law school"
coast in a vehicle using the freewheel
例句
An aircraft powered by a conventional propeller and supported in flight by a freewheeling, horizontal rotor that provides lift.旋翼机在飞行中以常规的螺旋桨来驱动并靠惯性滑行支持的，提供升力的水平旋转仪
