The Collaborative International Dictionary of English v.0.48:

Drudge \Drudge\ (dr[u^]j), v. i. [imp. & p. p. Drudged
   (dr[u^]jd); p. pr. & vb. n. Drudging.] [OE. druggen; prob
   not akin to E. drag, v. t., but fr. Celtic; cf. Ir. drugaire
   a slave or drudge.]
   To perform menial work; to labor in mean or unpleasant
   offices with toil and fatigue.
   [1913 Webster]

         He gradually rose in the estimation of the booksellers
         for whom he drudged.                     --Macaulay.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Drudge \Drudge\, v. t.
   To consume laboriously; -- with away.
   [1913 Webster]

         Rise to our toils and drudge away the day. --Otway.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Drudge \Drudge\, n.
   One who drudges; one who works hard in servile employment; a
   menial servant. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

drudge
    n 1: one who works hard at boring tasks [syn: hack, drudge,
         hacker]
    2: a laborer who is obliged to do menial work [syn: drudge,
       peon, navvy, galley slave]
    v 1: work hard; "She was digging away at her math homework";
         "Lexicographers drudge all day long" [syn: labor,
         labour, toil, fag, travail, grind, drudge,
         dig, moil]