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gash-gabbit

gash-gabbit, a. Sc.
  [f. gash (see gash n.2) + gabbit (f. gab n.2).]
  Having a projecting chin.

1721 Ramsay Poems Gloss. s.v. Gash, One with a long out chin, we call gash-gabet, or gash beard. 1813 D. Anderson Poems 125 (Jam.), A' teethless and gash-gabbit The hags that night.

Oxford English Dictionary

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