on all fours
with your hands and knees on the ground:
You'll have to get down on all fours to clean behind the toilet.

[TahlilGaran] Advanced Learner's Dictionary ▲

on all fours
with both hands and both knees on the ground.
I got down on all fours to look for her contact lens.

[TahlilGaran] English Idioms Dictionary ▲

on all fours
on one's hands and knees
The man was on all fours looking for his car keys.

I was down on all fours as I looked for my grandmother's hearing aide.

[TahlilGaran] English Idioms Dictionary ▲

on all fours
adv. phr.
1. On all four legs; on hands and knees.
Fido sat up to "beg" but dropped down on all fours to eat the dog biscuit Sam gave him.
Billy's father got down on all fours and gave the baby a ride.
2. informal On a level of equality; of the same value.
Wigs may be widely used, but they are still not on all fours with beautiful natural hair.

[TahlilGaran] English Idioms Dictionary ▲