on all fours
四肢著地,匍匐著
All fours 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.
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on all fours
adv : on hands and knees; "he got down on all fours to play with
his grandson"