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.2 (See quot.) [bɑk]Sh. 1908 Jak. (1928):
Bak, backwash of breakers; backflow after the breaking of a wave on the shore, de b[ak] o' de le [wave].