What is "to fag out"

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.

   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.