[1] : The Collaborative International Dictionary of English v.0.48

back \back\ ba^k, v. t. imp.  p. p. backed ba^kt; p.
   pr.  vb. n. backing.
   1913 webster
   1. to get upon the back of; to mount.
      1913 webster

            i will back him a horse straight.   --shak.
      1913 webster

   2. to place or seat upon the back. r.
      1913 webster

            great jupiter, upon his eagle backed,
            appeared to me.                       --shak.
      1913 webster

   3. to drive or force backward; to cause to retreat or recede;
      as, to back oxen.
      1913 webster

   4. to make a back for; to furnish with a back; as, to back
      books.
      1913 webster

   5. to adjoin behind; to be at the back of.
      1913 webster

            a garden . . . with a vineyard backed. --shak.
      1913 webster

            the chalk cliffs which back the beach. --huxley.
      1913 webster

   6. to write upon the back of; as, to back a letter; to
      indorse; as, to back a note or legal document.
      1913 webster

   7. to support; to maintain; to second or strengthen by aid or
      influence; as, to back a friend. "the parliament would be
      backed by the people." --macaulay.
      1913 webster

            have still found it necessary to back and fortify
            their laws with rewards and punishments. --south.
      1913 webster

            the mate backed the captain manfully. --blackw. mag.
      1913 webster

   8. to bet on the success of; -- as, to back a race horse.
      1913 webster

   to back an anchor naut., to lay down a small anchor ahead
      of a large one, the cable of the small one being fastened
      to the crown of the large one.

   to back the field, in horse racing, to bet against a
      particular horse or horses, that some one of all the other
      horses, collectively designated "the field", will win.

   to back the oars, to row backward with the oars.

   to back a rope, to put on a preventer.

   to back the sails, to arrange them so as to cause the ship
      to move astern.

   to back up, to support; to sustain; as, to back up one's
      friends.

   to back a warrant law, is for a justice of the peace, in
      the county where the warrant is to be executed, to sign or
      indorse a warrant, issued in another county, to apprehend
      an offender.

   to back water naut., to reverse the action of the oars,
      paddles, or propeller, so as to force the boat or ship
      backward.
      1913 webster
see also:
backed backing to back an anchor to back the field to back the oars to back a rope 
to back the sails to back up to back a warrant to back water 

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