The Collaborative International Dictionary of English v.0.48:

Rebuke \Re*buke"\ (r[-e]*b[=u]k"), v. t. [imp. & p. p. Rebuked
   (r[-e]*b[=u]kt"); p. pr. & vb. n. Rebuking.] [OF.
   rebouquier to dull, blunt, F. reboucher; perhaps fr. pref.
   re- re- + bouche mouth, OF. also bouque, L. bucca cheek; if
   so, the original sense was, to stop the mouth of; hence, to
   stop, obstruct.]
   To check, silence, or put down, with reproof; to restrain by
   expression of disapprobation; to reprehend sharply and
   summarily; to chide; to reprove; to admonish.
   [1913 Webster]

         The proud he tamed, the penitent he cheered,
         Nor to rebuke the rich offender feared.  --Dryden.
   [1913 Webster]

   Syn: To reprove; chide; check; chasten; restrain; silence.
        See Reprove.
        [1913 Webster]