The Collaborative International Dictionary of English v.0.48:

Moil \Moil\, v. t. [imp. & p. p. Moiled; p. pr. & vb. n.
   Moiling.] [OE. moillen to wet, OF. moillier, muillier, F.
   mouller, fr. (assumed) LL. molliare, fr. L. mollis soft. See
   Mollify.]
   To daub; to make dirty; to soil; to defile.
   [1913 Webster]

         Thou . . . doest thy mind in dirty pleasures moil.
                                                  --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Moil \Moil\, v. i. [From Moil to daub; prob. from the idea of
   struggling through the wet.]
   To soil one's self with severe labor; to work with painful
   effort; to labor; to toil; to drudge.
   [1913 Webster]

         Moil not too much under ground.          --Bacon.
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         Now he must moil and drudge for one he loathes.
                                                  --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Moil \Moil\, n.
   A spot; a defilement.
   [1913 Webster]

         The moil of death upon them.             --Mrs.
                                                  Browning.
   [1913 Webster]

WordNet (r) 3.0 (2006):

moil
    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]
    2: be agitated; "the sea was churning in the storm" [syn:
       churn, boil, moil, roil]
    3: moisten or soil; "Her tears moiled the letter"