When you crawl, you move forward on your hands and knees.

When an insect crawls somewhere, it moves there quite slowly.

If someone or something crawls somewhere, they move or progress slowly or with great difficulty.

If you say that a place is crawling with people or animals, you are emphasizing that it is full of them.

The crawl is a kind of swimming stroke which you do lying on your front, swinging one arm over your head, and then the other arm.

If something makes your skin crawl or makes your flesh crawl, it makes you feel shocked or disgusted.