Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BAK, n.1 (See quot.) [bɑ:k]Sh. 1908 Jak. (1928):
Bak, high and long wave, great baks o' waves; heavy swell, esp. when the wind is against the waves; der'r a (great, heavy) b[ak] i' de sea.