overdrive

(noun) the state of high or excessive activity or productivity or concentration. Examples: "Troops are ready to go into overdrive as soon as the signal is given." "Melissa's brain was in overdrive."

(noun) a high gear used at high speeds to maintain the driving speed with less output power.

(verb) drive or work too hard. Examples: "The teacher is overworking his students." "Overdriving people often suffer stress."

(verb) make use of too often or too extensively. Synonyms: overuse.