Answer: overdrive

AnswerCrossword Clue
OVERDRIVEState of increased productivity
OVERDRIVEFifth gear, often
OVERDRIVEBusy state to go into
OVERDRIVEIntensely active state
OVERDRIVEIntense state of activity
OVERDRIVEAutomatic gear.
OVERDRIVEYou may be in it on the highway
OVERDRIVEHighway gear
OVERDRIVEHigh gear on a car, perhaps
overdriveA 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
overdriveA state of high or excessive activity
overdriveto drive to excess
overdriveA mechanism that permits a higher than normal operating level in a piece of equipment, such as the amplifier of an electric guitar