noun, noun or participle which takes 'suru', intransitive verb
crawling forward on one's stomach; low crawl
Primarily a military term for advancing while keeping the body flat to the ground to avoid detection or fire. Also used figuratively for slow, painstaking progress.
兵士たちは敵の銃撃を避けるため、匍匐前進で進んだ。
The soldiers advanced by low crawl to avoid enemy gunfire.
This project is progressing at a crawl, like a low crawl.