Source : Webster's Revised Unabridged Dictionary (1913)

Imprecate \Im"pre*cate\, v. t. [imp. & p. p. {Imprecated}; p.
   pr. & vb. n. {Imprecating}.] [L. imprecatus, p. p. of
   imprecari to imprecate; pref. im- in, on + precari to pray.
   See {Pray}.]
   1. To call down by prayer, as something hurtful or
      calamitous.

            Imprecate the vengeance of Heaven on the guilty
            empire.                               --Mickle.

   2. To invoke evil upon; to curse; to swear at.

            In vain we blast the ministers of Fate, And the
            forlorn physicians imprecate.         --Rochester.

Source : WordNet®

imprecate
     v 1: wish harm upon; invoke evil upon; "The bad witch cursed the
          child" [syn: {curse}, {beshrew}, {damn}, {bedamn}, {anathemize},
           {anathemise}, {maledict}] [ant: {bless}]
     2: utter obscenities or profanities; "The drunken men were
        cursing loudly in the street" [syn: {curse}, {cuss}, {blaspheme},
         {swear}]