The Collaborative International Dictionary of English v.0.48:

Transgress \Trans*gress"\, v. t. [imp. & p. p. Transgressed;
   p. pr. & vb. n. Transgressing.] [Cf. F. transgresser. See
   Transgression.]
   1. To pass over or beyond; to surpass. [R.]
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            Surpassing common faith, transgressing nature's law.
                                                  --Dryden.
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   2. Hence, to overpass, as any prescribed as the ?imit of
      duty; to break or violate, as a law, civil or moral.
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            For man will hearken to his glozing lies,
            And easily transgress the sole command. --Milton.
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   3. To offend against; to vex. [Obs.]
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            Why give you peace to this imperate beast
            That hath so long transgressed you ?  --Beau. & Fl.
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The Collaborative International Dictionary of English v.0.48:

Transgress \Trans*gress"\, v. i.
   To offend against the law; to sin.
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         Who transgressed in the thing accursed.  --I Chron. ii.
                                                  7.
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WordNet (r) 3.0 (2006):

transgress
    v 1: act in disregard of laws, rules, contracts, or promises;
         "offend all laws of humanity"; "violate the basic laws or
         human civilization"; "break a law"; "break a promise" [syn:
         transgress, offend, infract, violate, go against,
         breach, break] [ant: keep, observe]
    2: spread over land, especially along a subsiding shoreline;
       "The sea transgresses along the West coast of the island"
    3: commit a sin; violate a law of God or a moral law [syn:
       sin, transgress, trespass]
    4: pass beyond (limits or boundaries) [syn: transgress,
       trespass, overstep]