free wheel
(rear) wheel on a bicycle that continues to revolve when the pedals are not in use （自行车的）飞轮. ,free-`wheel v [I]
1 travel, usu downhill, by riding a bicycle without pedalling or driving a car without using engine power （自行车或汽车）滑行.
2 move or act freely or irresponsibly 自由地、 不须负责地活动或行动
I think I'll just free-wheel this summer and see what happens. 我打算今年夏天尽情放任一下再说.