from
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]