overdrive
n
1 [U] mechanism providing an extra gear above the normal top gear in a vehicle (車輛中的)加速傳動裝置, 加速擋.
2 (idm 習語) go into `overdrive use the overdrive mechanism 使用加速擋
(fig 比喻) She always goes into overdrive (ie starts working very hard) before the holidays. 她總是在放假前特別努力.