1) In a crawling position 2) Meekly creeping 
adj. a reference to a lawsuit in which all the legal issues are identical (or so close as to make no difference) to another case, particularly an appeals decision which is a precedent in deciding the suit before the court. Thus, an attorney will argue that the prior case of, for example, Steele v. Merritt is "on all fours" with the case before the ...
A condition in which two cases have similar circumstances and can give rise to same legal questions and since the facts leadng to determination of decision is similar the jugement given by the court in both the cases will also be similar.
Slang for a case or other precedent which shares near-identical facts or issues. (See: precedent)
[adv] - on hands and knees
adverb on hands and knees; `he got down on all fours to play with his grandson`