[UNDER-1 5 b. Cf. Du. onderlip, G. unterlippe, Sw. underläpp, Da. underlæbe.]
1. The lower lip of a person, animal, or insect.
1669. Holder, Elem. Speech, 25. The Tongue and under-Lip … are moveable.
a. 1735. Arbuthnot, State Learn. Lilliput, Misc. Wks. 1751, I. 145. At that … he put out his Under-Lip.
1737. Challoner, Cath. Chr. Instr. (1753), 71. His Tongue a little advanced on his Under-lip.
1826. Kirby & Sp., Entomol., III. xxx. 124. These maxillæ of larvæ were regarded … as parts of the under-lip, on each side of which they are situated.
1855. Tennyson, Maud, I. ii. 9. An underlip, you may call it a little too ripe, too full.
1882. ‘F. Anstey,’ Vice Versâ, i. His big underlip drooped rather weakly.
b. spec. (See quot.)
1908. Animal Managem., 32. ‘Upperlip’ and ‘underlip’ are the names used to denote white skin at the edges of the lips [of horses].
2. In an organ-pipe: (see quots.).
1852. Seidel, Organ, 78. The under lip, on the foot, and immediately below the language.
1875. Knight, Dict. Mech., 1709. The foot is an inverted cone, formed in a similar manner, and having a corresponding indentation, called the under lip.
