Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
UNDERSOOK, n. An undercurrent flowing in a direction opposite to that of the surface water, underflow (Sh. 1904 E.D.D., Sh., Mry., Fif. 1973).
[Under- + sook s.v. Souk, n., v.]