lip in WordNet English dictionary

1. an impudent or insolent rejoinder
   "don't give me any of your sass"
   sass  sassing  backtalk  back talk  lip  mouth 
   
2. the top edge of a vessel or other container
   brim  rim  lip 
   
3. either the outer margin or the inner margin of the aperture of a gastropod's shell
   lip 
   
4. either of two fleshy folds of tissue that surround the mouth and play a role in speaking
   lip 
   
5. (botany) either of the two parts of a bilabiate corolla or calyx
   lip