1
- a gear in a motor vehicle providing a gear ratio higher than that of direct drive (the usual top gear), so that the engine speed can be reduced at high road speeds to lessen fuel consumption or to allow further acceleration超速挡。
1.1
- mass noun a state of high or excessive activity极度忙碌; 工作过度：
the city's worried public relations arm went into overdrive.
忧心忡忡的市公关部门开始紧张地忙碌起来。
1.2
- a mechanism which permits the exceeding of some normal operating level in a piece of equipment, especially the amplifier of an electric guitar（设备的）超常态操作装置（尤指电吉他的放大器）。
with obj.［usu. as adj. overdriven /-ˈdrɪvən/］
- drive or work to exhaustion过度驱使; 使工作过度：
the overdriven mothers of ten or eleven hungry children.
有10或11个挨饿孩子的劳累过度的母亲们。