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"
drive or work too hard; "The teacher is overworking his students"; "Overdriving people often suffer stress"
leave behind empty; move out of; "You must vacate your office by tonight"
leave (a job, post, or position) voluntarily; "She vacated the position when she got pregnant"; "The chairman resigned when he was found to have misappropriated funds"