The Collaborative International Dictionary of English v.0.48:

Off \Off\, prep.
   Not on; away from; as, to be off one's legs or off the bed;
   two miles off the shore. --Addison.
   [1913 Webster]

   Off hand. See Offhand.

   Off side
   (Football), out of play; -- said when a player has got in
              front of the ball in a scrimmage, or when the ball
              has been last touched by one of his own side
              behind him.

   To be off color,
   (a) to be of a wrong color.
   (b) to be mildly obscene.

   To be off one's food or To be off one's feed, (Colloq.)
      to have no appetite; to be eating less than usual.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Off \Off\, a.
   1. On the farther side; most distant; on the side of an
      animal or a team farthest from the driver when he is on
      foot; in the United States, the right side; as, the off
      horse or ox in a team, in distinction from the nigh or
      near horse or ox; the off leg.
      [1913 Webster]

   2. Designating a time when one is not strictly attentive to
      business or affairs, or is absent from his post, and,
      hence, a time when affairs are not urgent; as, he took an
      off day for fishing: an off year in politics. "In the off
      season." --Thackeray.
      [1913 Webster]

   3. Designating a time when one's performance is below normal;
      as, he had an off day.
      [PJC]

   Off side.
      (a) The right hand side in driving; the farther side. See
          Gee.
      (b) (Cricket) See Off, n.
          [1913 Webster]