noun, noun or participle which takes 'suru', intransitive verb
Describes moving close to the ground, often on hands and knees or belly. Can be literal (military, babies) or figurative (sneaking, slow progress).
兵士たちは匍匐前進で敵陣に近づいた。
The soldiers approached the enemy position by crawling forward.
The baby is crawling on the floor.