Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BUIRK, Birk, v. “To belch, ‘rift,' eructate” (Ork. 1929 Marw.; Fif.1 1937, birk. Cf. Bock, v. (1). [børk, bɪ̢̈rk]
Hence birky, “provocative of belching, e.g. used of aerated waters” (Fif.1 1937).