overdrive

n 1 [U] mechanism providing an extra gear above the normal top gear in a vehicle （车辆中的）加速传动装置, 加速挡. 2 (idm 习语) go into `overdrive use the overdrive mechanism 使用加速挡: (fig 比喻) She always goes into overdrive (ie starts working very hard) before the holidays. 她总是在放假前特别努力.

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