Err

from WordNet (r) 3.0 (2006)
err
    v 1: to make a mistake or be incorrect [syn: {err}, {mistake},
         {slip}]
    2: wander from a direct course or at random; "The child strayed
       from the path and her parents lost sight of her"; "don't
       drift from the set course" [syn: {stray}, {err}, {drift}]
    
from The Collaborative International Dictionary of English v.0.48
Err \Err\ ([~e]r), v. i. [imp. & p. p. {Erred}; p. pr. & vb. n.
   {Erring} (?; 277, 85).] [F. errer, L. errare; akin to G.
   irren, OHG. irran, v. t., irr[=o]n, v. i., OS. irrien, Sw.
   irra, Dan. irre, Goth, a['i]rzjan to lead astray, airzise
   astray.]
   1. To wander; to roam; to stray. [Archaic] "Why wilt thou err
      from me?" --Keble.
      [1913 Webster]

            What seemeth to you, if there were to a man an
            hundred sheep and one of them hath erred. --Wyclif
                                                  (Matt. xviii.
                                                  12).
      [1913 Webster]

   2. To deviate from the true course; to miss the thing aimed
      at. "My jealous aim might err." --Shak.
      [1913 Webster]

   3. To miss intellectual truth; to fall into error; to mistake
      in judgment or opinion; to be mistaken.
      [1913 Webster]

            The man may err in his judgment of circumstances.
                                                  --Tillotson.
      [1913 Webster]

   4. To deviate morally from the right way; to go astray, in a
      figurative sense; to do wrong; to sin.
      [1913 Webster]

            Do they not err that devise evil?     --Prov. xiv.
                                                  22.
      [1913 Webster]

   5. To offend, as by erring.
      [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
62 Moby Thesaurus words for "err":
      backslide, be in error, be mistaken, be wrong, blunder, bungle,
      commit sin, degenerate, deviate, divagate, do amiss, do wrong,
      drift, excurse, fall, fall into error, foozle, go adrift, go amiss,
      go astray, go awry, go wrong, goof, judge amiss, lapse, meander,
      misappreciate, misbelieve, miscalculate, miscompute, misconjecture,
      misconstrue, misdeem, misesteem, misestimate, misevaluate,
      misinterpret, misjudge, misreckon, miss, miss the mark, misthink,
      misvalue, offend, pererrate, ramble, rove, serve Mammon, sin, slip,
      slip up, snake, straggle, stray, stumble, transgress, trespass,
      trip, twist, twist and turn, wander, wind

    

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