"Watchit" is a slang term that means "be careful" or "pay attention." There are several synonyms for this term that can also convey the same message. "Be alert" is a common synonym for "watchit." It implies being aware of one's surroundings and staying focused. "Be mindful" is another synonym that suggests being present and aware of one's thoughts and actions. Similar phrases like "keep your eyes peeled" and "stay on guard" can also be used interchangeably with "watchit." Ultimately, these synonyms convey the need to stay aware and cautious in all situations to avoid any potential dangers.