The Collaborative International Dictionary of English v.0.48:

Rob \Rob\, n. [F.; cf. Sp. rob, It. rob, robbo, Pg. robe,
   arrobe, Ar. rubb, robb, Per. rub.]
   The inspissated juice of ripe fruit, obtained by evaporation
   of the juice over a fire till it acquires the consistence of
   a sirup. It is sometimes mixed with honey or sugar. [Written
   also rhob, and rohob.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rob \Rob\, v. t. [imp. & p. p. Robbed; p. pr. & vb. n.
   Robbing.] [OF. rober, of German origin; cf. OHG. roub?n, G.
   rauben, and OHG. roub robbing, booty, G. raub. [root]114. See
   Reave,and cf. Robe.]
   1. To take (something) away from by force; to strip by
      stealing; to plunder; to pillage; to steal from.
      [1913 Webster]

            Who would rob a hermit of his weeds,
            His few books, or his beads, or maple dish?
                                                  --Milton.
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            He that is robbed, not wanting what is stolen,
            Let him not know it, and he's not robbed at all.
                                                  --Shak.
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            To be executed for robbing a church.  --Shak.
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   2. (Law) To take the property of (any one) from his person,
      or in his presence, feloniously, and against his will, by
      violence or by putting him in fear.
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   3. To deprive of, or withhold from, unjustly or injuriously;
      to defraud; as, to rob one of his rest, or of his good
      name; a tree robs the plants near it of sunlight.
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            I never robbed the soldiers of their pay. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Rob \Rob\, v. i.
   To take that which belongs to another, without right or
   permission, esp. by violence.
   [1913 Webster]

         I am accursed to rob in that thief's company. --Shak.
   [1913 Webster] Robalo

WordNet (r) 3.0 (2006):

rob
    v 1: take something away by force or without the consent of the
         owner; "The burglars robbed him of all his money"
    2: rip off; ask an unreasonable price [syn: overcharge,
       soak, surcharge, gazump, fleece, plume, pluck,
       rob, hook] [ant: undercharge]