crawl across (something)

1. Of a person, to move across an area on one's hands and knees. When I turned back around, the baby was already crawling across the room! OK, you're gonna have to pick that stuff up for me because I'm too old to get down and crawl across the floor after it. Each student doing the first leg of the relay race had to across the gym floor to a waiting teammate.

2. Of an animal or insect, to walk across an area. When I saw the bee crawling across the windowsill, I bolted out of the room. A: "Ah! What is that crawling across the floor?" B: "Hmm, looks like some sort of beetle." Don't worry, it's just a ladybug crawling across the deck.

crawl across something

and crawl along something

[for someone] to move across something on hands and knees; [for an insect or something similar] to walk across something. The wounded officer had to crawl across the open area to get to safety. The caterpillar crawled across the leaf and stopped at the end. She crawled along the catwalk, fearing to look down.