He forced the dog to clamp the leash with its teeth.

He was slowly chewing the steak.

After failing, he blamed himself and was biting his own navel (figuratively expressing deep regret).

She started a special exercise to strengthen the incisivus labii inferioris muscle.

He bit his both lips trying to hide his nervousness.

In Sanskrit phonology, the sounds within the lips are very important.

In female anatomy, the labia minora is a very important part.

A labiodental is a sound produced using the lips and teeth.

In female anatomy, the labia occupy an important part.

This shell's outer lip has a very beautiful pattern.