D defs.my
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Entry 1 sense Webster, 1913

All fours

· All· fours · IPA
01 All four legs of a quadruped; or the two legs and two arms of a person.
  1. 1.
    All four legs of a quadruped; or the two legs and two arms of a person.
Phrases & compounds
To be, go, [or] run, on all fours — to be on the same footing; to correspond (with) exactly; to be alike in all the circumstances to be considered.