rat1/ræt; ræt/n [C] an animal like a large mouse 大老鼠
rat2v [I] ratted , ratting informal if someone rats on you, they tell someone in authority about something wrong that you have done【非正式】告发﹐打小报告: +on They’ll kill you if they find out you’ve ratted on them! 要是他们发现你告发他们了﹐会宰了你的!