[{"Bold_text": "noun", "List Items": ["any of several long-tailed rodents of the family Muridae, of the genus Rattusand related genera, distinguished from the mouse by being larger.", "any of various mammals similar to or related to the long-tailed rodents of the genus Rattus.", "Slang.a scoundrel .", "Slang.a person who abandons or betrays their party or associates, especially in a time of trouble.an informer .a scab laborer.", "a person who abandons or betrays their party or associates, especially in a time of trouble.", "an informer .", "a scab laborer.", "Slang.a person who frequents a specified place:gym rats.a mall rat;gym rats.", "a pad with tapered ends formerly used in women's hairstyles to give the appearance of greater thickness."]}, {"Bold_text": "interjection", "List Items": ["rats,Slang.(an exclamation of disappointment, disgust, or disbelief.)"]}, {"Bold_text": "verb (used without object)", "List Items": ["Slang.to desert one's party or associates, especially in a time of trouble.to turn informer; squeal :He ratted on the gang, and the police arrested them.to work as a scab.", "to desert one's party or associates, especially in a time of trouble.", "to turn informer; squeal :He ratted on the gang, and the police arrested them.", "to work as a scab.", "to hunt or catch rats."]}, {"Bold_text": "verb (used with object)", "List Items": ["to make (the hair) appear thicker by use of a small pad of material or by teasing."]}, {"Bold_text": "verb phrase", "List Items": ["Slang.to inform on inform on:He ratted out his partners in exchange for a lighter sentence."]}]