[JAW sb.1] A gaping fissure or opening; an abyss.
1840. T. A. Trollope, Summer in Brittany, II. xxxiv. 187. A sort of jaw-hole, or abyss, moreover, is still pointed out between Huelgoat and Carhaix, which this vixen of a princess used as a second—or rather first—Tour de Nesle.
1876. Whitby Gloss., Jaw-hooal, a fissure or opening in the land, as the mouth of a stream. The arched entrance to a cavern.
