WordWeb Online

1. 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"
    
2. A high gear used at high speeds to maintain the driving speed with less output power

1. Drive or work too hard
   "Overdriving people often suffer stress"
    
2. Make use of too often or too extensively
   - overuse, overutilize, overutilise [Brit]

Derived forms: overdrives, overdriven, overdriving, overdrove

Type of: action, activeness, activity, apply, employ, exploit, high, high gear, overwork, use, utilise [Brit], utilize

Encyclopedia: Overdrive