1. overdrive

the state of high or excessive activity or productivity or concentration

Example Sentences:
'Troops are ready to go into overdrive as soon as the signal is given'
'Melissa's brain was in overdrive'

2. overdrive

a high gear used at high speeds to maintain the driving speed with less output power

3. overdrive

drive or work too hard

Example Sentences:
'The teacher is overworking his students'
'Overdriving people often suffer stress'

4. overdrive, overuse

make use of too often or too extensively

• overuse