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a gear in a motor vehicle providing a gear ratio higher than that of the drive gear or top gear, so that engine speed and fuel consumption are reduced in highway travel. a state of high or excessive activity:the city’s worried public relations arm went into overdrive a mechanism that permits a higher than normal operating level in a piece of equipment, such as the amplifier of an electric guitar.
verb [with object] (usually as adjective overdriven)
drive or work to exhaustion:the overdriven mothers of ten or eleven hungry children