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

all fours \all` fours"\ formerly, all` four".
   all four legs of a quadruped; or the two legs and two arms of
   a person.
   1913 webster

   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.
      1913 webster
see also:
all` four" to be go run on all fours 

[2] : WordNet (r) 2.0

on all fours
     adv : on hands and knees; "he got down on all fours to play with
           his grandson"

All >> A Words
All, definition of term: All
all_pag1.html

All Ready >> A Words
All Ready, definition of term: All Ready
all+ready_pag1.html

All Right >> A Words
All Right, definition of term: All Right
all+right_pag1.html

All That >> A Words
All That, definition of term: All That
all+that_pag1.html

All Round >> A Words
All Round, definition of term: All Round
all+round_pag1.html

All Hands >> A Words
All Hands, definition of term: All Hands
all+hands_pag1.html

All Along >> A Words
All Along, definition of term: All Along
all+along_pag1.html

All But >> A Words
All But, definition of term: All But
all+but_pag1.html

Above All >> A Words
Above All, definition of term: Above All
above+all_pag1.html

After All >> A Words
After All, definition of term: After All
after+all_pag1.html

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