crawler

noun

1. 1.A person who is abused, physically or verbally, and returns to the abuser a supplicant.
2. 2.A sycophant.
3. 3.A child who is able to creep using his hands and knees but is not able to walk.
4. 4.A crawl swimmer.
5. 5.A tractor crawler, a motorized vehicle that uses caterpillar tracks instead of wheels.