rocker
n
1 either of the curved pieces of wood on which a rocking-chair, etc rests （摇椅等下面的）弧形摇板. =>illus at App 1 见附录1插图, page xvi.
2 = rocking-chair.
3 (also `rocker switch) switch that changes from `on' to `off' by means of a rocking action 摇臂式开关; 摇压开关.
4 Rocker (Brit) member of a 1960's teenage gang or their later followers, wearing leather jackets and riding motor bikes 洛可帮（20世纪60年代的青少年帮派, 好穿皮夹克和骑摩托车）的成员或其追随者. Cf 参看 mod.
5 (idm 习语) off one's `rocker (sl 俚) out of one's mind; crazy 精神失常; 发疯
You must be off your rocker! 你简直疯了!