1. 
[syn: drudging, laboring, labouring, toiling]
The Collaborative International Dictionary of English v.0.48:
Toil \Toil\, v. i. [imp. & p. p. Toiled; p. pr. & vb. n.
   Toiling.] [OE. toilen to pull about, to toil; of uncertain
   origin; cf. OD. teulen, tuylen, to labor, till, or OF.
   tooillier, toailler, to wash, rub (cf. Towel); or perhaps
   ultimately from the same root as E. tug.]
   To exert strength with pain and fatigue of body or mind,
   especially of the body, with efforts of some continuance or
   duration; to labor; to work.
   [1913 Webster]
WordNet (r) 3.0 (2006):
toiling
    adj 1: doing arduous or unpleasant work; "drudging peasants";
           "the bent backs of laboring slaves picking cotton";
           "toiling coal miners in the black deeps" [syn:
           drudging, laboring, labouring, toiling]