- in conformity with; corresponding exactly with.
- (of a person) on the hands and feet, or the hands and knees: I had to go on all fours to squeeze through the low opening.
Origin of all fours
Examples from the Web for all fours
Elizabeth slipped as her feet struck the ground and she landed on “all-fours” in the grass.The Wind Before the Dawn|Dell H. Munger
The old man crawled out at their approach and still on all-fours accosted Bert and Laurier.The War in the Air|Herbert George Wells
The poor Friar, who was not able to stand upon his leg, crawled on all-fours out of the sty, crying for mercy as loud as he could.The Tales Of The Heptameron, Vol. IV. (of V.)|Margaret, Queen Of Navarre
If you asked him for some idea how they looked and behaved, he would get shy and mutter something about 'walking on all-fours.'Heart of Darkness|Joseph Conrad
The front of his elbows and knees had become hardened from going on all-fours with the wolves.