[1] : The Collaborative International Dictionary of English v.0.48

fag \fag\, v. i. imp.  p. p. fagged fa^gd; p. pr.  vb.
   n. fagging fa^g"gi^ng. cf. lg. fakk wearied, weary,
   vaak slumber, drowsiness, ofries. fai, equiv. to f=ach
   devoted to death, os. f=egi, ohg. feigi, g. feig, feige,
   cowardly, icel. feigr fated to die, as. f=aege, 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
see also:
fagged fagging to fag out 

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