noun
on all fours; crawling on hands and knees
Describes the posture of being on hands and knees, or moving in that position. Often used with verbs like なる or 這う.
赤ちゃんが四つん這いで部屋の中を動き回っている。
The baby is crawling around the room on all fours.
彼は四つん這いになって床
He got down on his hands and knees and looked for the pen on the floor.