knock out

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verb

Definition of KNOCK OUT

to use up all the physical energy of <the entire staff knocked itself out getting the project finished on time>

Synonyms break, burn out, bust, do in, do up, drain, fag, fatigue, frazzle, harass, kill, knock out, outwear, tire, tucker (out), wash out, wear, wear out, weary

Related Words debilitate, enervate, enfeeble, sap, waste, weaken

Near Antonyms activate, energize, invigorate, rejuvenate, strengthen, vitalize; relax, rest, unwind