The term "crawling thing" can refer to any small, multi-legged creatures that move on their bellies. Synonyms for this phrase include, but are not limited to: bugs, critters, insects, arachnids, spiders, worms, centipedes, millipedes, maggots, larvae, grubs, and slugs. These creatures can be found in various environments, such as the backyard, forest, and even the inside of homes. Depending on the species, they may be harmless or pose a threat to humans, causing discomfort or illness. Therefore, it is important to take precautionary measures when encountering a crawling thing in order to prevent harm to oneself or the environment.