underlip

noun

1. The lower lip.

   “He bit his under-lip as though he were somewhat unwilling, but arose.”

   “In fact, there was such an obvious inclination to wateriness about his eye, and instability about his underlip, that Cripps found it necessary to put the conversation on a less emotional basis.”

   “His eyes were closed, his mouth opened. His breathing, irregular for three, then four, then five breaths, returned to its normal, soundless rhythm. Stubbled overlip and wet underlip moved about some final, silent word: […]”