fag

1 to devote serious and sustained effort the road crew fagged mightily to move the boulder out of the way Synonyms bang away, beaver (away), dig (away), drudge, endeavor, labor, grub, hump, hustle, moil, peg (away), plod, plow, plug, slave, slog, strain, strive, struggle, sweat, toil, travail, tug, workRelated Words apply (oneself), buckle (down), dig in, hammer (away), knuckle down, pitch in; attack, drive; essay, try; exercise, exert, overexert, overwork; eke out, grind (out), put out, scrabble, scratch; trudge, wadeNear Antonyms break, ease (up), let up, slacken; bum, chill, dally, dillydally, footle, goldbrick, goof (off), hack (around), hang (around or out), idle, laze, loaf, lounge, shirk, slack (off), veg out; bask, loll, relax, repose, rest, unwind; dabble, doodle, fool around, fribble, goof (around), hang, hang about [British], mess around, monkey (around), play, potter (around), putter (around), trifle

2 to use up all the physical energy of the long hike up the mountain had fagged us out Synonyms break, burn out, bust, do in, do up, drain, exhaust, fatigue, frazzle, harass, kill, knock out, outwear, tire, tucker (out), wash out, wear, wear out, wearyRelated Words debilitate, enervate, enfeeble, sap, waste, weakenNear Antonyms activate, energize, invigorate, rejuvenate, strengthen, vitalize; relax, rest, unwind