Nouns

(n)overdrivethe 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”
(n)overdrivea high gear used at high speeds to maintain the driving speed with less output power

Verbs

(v)overdrivedrive or work too hard“Overdriving people often suffer stress”
(v)overuse, overdrivemake use of too often or too extensively