She seemed nervous, biting her lower lip.

She seemed nervous, biting her lower lip.

He bit his both lips trying to hide his nervousness.

He is studying the shape of the inner lip of the shell.

The columellar lip of this shell has a very beautiful shape.

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

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

In female anatomy, the labia occupy an important part.

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

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