noun, adjective, verb, lipped, lip⋅ping.| 1. | either of the two fleshy parts or folds forming the margins of the mouth and functioning in speech. |
| 2. | Usually, lips. these parts as organs of speech: I heard it from his own lips. |
| 3. | a projecting edge on a container or other hollow object: the lip of a pitcher. |
| 4. | a liplike part or structure, esp. of anatomy. |
| 5. | any edge or rim. |
| 6. | the edge of an opening or cavity, as of a canyon or a wound: the lip of the crater. |
| 7. | Slang. impudent talk; back talk: Don't give me any of your lip. |
| 8. | Botany. either of the two parts into which the corolla or calyx of certain plants, esp. of the mint family, is divided. |
| 9. | Zoology.
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| 10. | Music. the position and arrangement of lips and tongue in playing a wind instrument; embouchure. |
| 11. | the cutting edge of a tool. |
| 12. | the blade, at the end of an auger, which cuts the chip after it has been circumscribed by the spur. |
| 13. | (in a twist drill) the cutting edge at the bottom of each flute. |
| 14. | of or pertaining to the lips or a lip: lip ointment. |
| 15. | characterized by or made with the lips: to read lip movements. |
| 16. | superficial or insincere: to offer lip praise. |
| 17. | to touch with the lips. |
| 18. | Golf. to hit the ball over the rim of (the hole). |
| 19. | to utter, esp. softly. |
| 20. | to kiss. |
| 21. | to use the lips in playing a musical wind instrument. |
| 22. | lip off, Slang. to talk impudently or belligerently. |
| 23. | bite one's lip or tongue, to repress one's anger or other emotions: He wanted to return the insult, but bit his lip. |
| 24. | button one's lip, Slang. to keep silent, esp., to refrain from revealing information: They told him to button his lip if he didn't want trouble. Also, button up. |
| 25. | hang on the lips of, to listen to very attentively: The members of the club hung on the lips of the visiting lecturer. |
| 26. | keep a stiff upper lip,
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| 27. | smack one's lips, to indicate one's keen enjoyment or pleasurable anticipation of: We smacked our lips over the delicious meal. |

lip
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lip (lĭp)
n.
Either of two fleshy folds that surround the opening of the mouth.
A liplike structure bounding or encircling a bodily cavity or groove.
bite one's tongue
Refrain from speaking out, as in A new grandmother must learn to bite her tongue so as not to give unwanted advice, or I'm sure it'll rain during graduation.
Bite your tongue! This term alludes to holding the tongue between the teeth in an effort not to say something one might regret. Shakespeare used it in 2 Henry VI (1:1): "So York must sit and fret and bite his tongue." Today it is sometimes used as a humorous imperative, as in the second example, with the implication that speaking might bring bad luck. [Late 1500s] Also see hold one's tongue.