Definition - overdrive

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overdrive
  1. make use of too often or too extensively
  2. drive or work too hard; "The teacher is overworking his students"; "Overdriving people often suffer stress"
  3. a high gear used at high speeds to maintain the driving speed with less output power
  4. 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"