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From 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]