all fours

• POS: Noun Phrase

CIDE DICTIONARY

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.