From The Collaborative International Dictionary of English v.0.48:
Fag \Fag\ (f[a^]g) n. 1. A knot or coarse part in cloth; a flaw. [Obs.] [1913 Webster]
2. A cigarette. [slang] [PJC]
3. A fag end in a cloth. [PJC]
4. A drudge. [PJC]
From The Collaborative International Dictionary of English v.0.48:
fag \fag\ (f[a^]g), n. A male homosexual; -- always used disparagingly and considered offensive. Shortened form of faggot. [Slang, disparaging.]
Syn: faggot. [PJC]
From The Collaborative International Dictionary of English v.0.48:
Fag \Fag\, v. i. [imp. & p. p. Fagged (f[a^]gd); p. pr. & vb. n. Fagging (f[a^]g"g[i^]ng).] [Cf. LG. fakk wearied, weary, vaak slumber, drowsiness, OFries. fai, equiv. to f[=a]ch devoted to death, OS. f[=e]gi, OHG. feigi, G. feig, feige, cowardly, Icel. feigr fated to die, AS. f[=ae]ge, Scot. faik, to fail, stop, lower the price; or perh. the same word as E. flag to droop.] 1. To become weary; to tire. [1913 Webster]
Creighton withheld his force till the Italian began to fag. --G. Mackenzie. [1913 Webster]
2. To labor to wearness; to work hard; to drudge. [1913 Webster]
Read, fag, and subdue this chapter. --Coleridge. [1913 Webster]
3. To act as a fag, or perform menial services or drudgery, for another, as in some English schools. [1913 Webster]
To fag out, to become untwisted or frayed, as the end of a rope, or the edge of canvas. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Fag \Fag\, v. t. 1. To tire by labor; to exhaust; as, he was almost fagged out. [1913 Webster]
2. Anything that fatigues. [R.] [1913 Webster]
It is such a fag, I came back tired to death. --Miss Austen. [1913 Webster]
Brain fag. (Med.) See Cerebropathy. [1913 Webster]