What is the meaning of lip?

noun

• Either of two fleshy folds of tissue that surround the mouth and play a role in speaking.
• Botany) either of the two parts of a bilabiate corolla or calyx. (
• An impudent or insolent rejoinder.
  • usage: "don't give me any of your sass"
  • synonyms: sass, sassing, backtalk, back talk, mouth
• The top edge of a vessel or other container.
  • synonyms: brim, rim
• Either the outer margin or the inner margin of the aperture of a gastropod's shell. .