Source : Webster's Revised Unabridged Dictionary (1913)

Derogate \Der"o*gate\, v. i.
   1. To take away; to detract; to withdraw; -- usually with
      from.

            If we did derogate from them whom their industry
            hath made great.                      --Hooker.

            It derogates little from his fortitude, while it
            adds infinitely to the honor of his humanity.
                                                  --Burke.

   2. To act beneath one-s rank, place, birth, or character; to
      degenerate. [R.]

            You are a fool granted; therefore your issues, being
            foolish, do not derogate.             --Shak.

            Would Charles X. derogate from his ancestors? Would
            he be the degenerate scion of that royal line?
                                                  --Hazlitt.

Derogate \Der"o*gate\, n. [L. derogatus, p. p.]
   Diminished in value; dishonored; degraded. [R.] --Shak.

Derogate \Der"o*gate\, v. t. [imp. & p. p. {Derogated}; p. pr. &
   vb. n. {Derogating}.] [L. derogatus, p. p. of derogare to
   derogate; de- + rogare to ask, to ask the people about a law.
   See {Rogation}.]
   1. To annul in part; to repeal partly; to restrict; to limit
      the action of; -- said of a law.

            By several contrary customs, . . . many of the civil
            and canon laws are controlled and derogated. --Sir
                                                  M. Hale.

   2. To lessen; to detract from; to disparage; to depreciate;
      -- said of a person or thing. [R.]

            Anything . . . that should derogate, minish, or hurt
            his glory and his name.               --Sir T. More.

Source : WordNet®

derogate
     v : belittle; "Don't belittle his influence" [syn: {minimize}, {belittle},
          {denigrate}]