[UNDER-1 5 b.] The lower jaw.
1607. Topsell, Four-f. Beasts, 29. Their vnderchappe doeth in a deformed manner stretch foorth it selfe beyond the vpper, as it is in many fishes.
a. 1608. Dee, Relat. Spir., I. (1659), 78. He striketh him with an yern,… griping his brain and underchaps, and so he fell down and disappeared.
1774. Goldsm., Nat. Hist., V. 382. The stork … produces no other noise than the clacking of its under chap against the upper.
1802. Paley, Nat. Theol., xxiii. The skin which lies between the under chaps.
