\Fag\n.
A knot or coarse part in cloth. [Obs.]

\Fag\, v. i. [imp. & p. p. {Fagged}; p. pr. & vb. n.
{Fagging}.] [Cf. LG. fakk wearied, weary, vaak slumber,
drowsiness, OFries. fai, equiv. to f[=a]ch devoted to death,
OS. f?gi, OHG. feigi, G. feig, feige, cowardly, Icel. feigr
fated to die, AS. f?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.
         Creighton withheld his force till the Italian began
         to fag.                               --G.
                                               Mackenzie.
2. To labor to wearness; to work hard; to drudge.
         Read, fag, and subdue this chapter.   --Coleridge.
3. To act as a fag, or perform menial services or drudgery,
   for another, as in some English schools.
{To fag out}, to become untwisted or frayed, as the end of a
   rope, or the edge of canvas.

\Fag\, v. t.
1. To tire by labor; to exhaust; as, he was almost fagged
   out.
2. Anything that fatigues. [R.]
         It is such a fag, I came back tired to death. --Miss
                                               Austen.
{Brain fag}. (Med.) See {Cerebropathy}.