Source : Webster's Revised Unabridged Dictionary (1913)

All fours \All` fours"\ [formerly, {All` four"}.]
   All four legs of a quadruped; or the two legs and two arms of
   a person.

   {To be}, {go}, or {run}, {on all fours} (Fig.), to be on the
      same footing; to correspond (with) exactly; to be alike in
      all the circumstances to be considered. ``This example is
      on all fours with the other.'' ``No simile can go on all
      fours.'' --Macaulay.

Four \Four\, n.
   1. The sum of four units; four units or objects.

   2. A symbol representing four units, as 4 or iv.

   3. Four things of the same kind, esp. four horses; as, a
      chariot and four.

   {All fours}. See {All fours}, in the Vocabulary.

Source : WordNet®

all fours
     n : card games in which points are won for taking the high or
         low or jack or game [syn: {high-low-jack}]