underlip
UK /ˈʌndə(ɹ)ˌlɪp/ · US /ˈʌndɚˌlɪp/ noun
Forms underlips
Etymology
From under- + lip. Compare Saterland Frisian Unnerlippe (“underlip”), German Unterlippe (“underlip”).
Webster’s 1913
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “underlip”, CC BY-SA 4.0. Details