overdrive

Noun

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

• the state of high or excessive activity or productivity or concentration
  • Troops are ready to go into overdrive as soon as the signal is given
    
  • Melissa's brain was in overdrive
    

Verb

• make use of too often or too extensively

• drive or work too hard
  • The teacher is overworking his students
    
  • Overdriving people often suffer stress