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.
STRUTH, n. A channel in the sand and mud-flats in Torryburn Bay in the Forth estuary in which flounders are speared when the tide recedes. [strʌθ]Fif. 1928 Edb. Ev. Dispatch (18 Dec.) 6:
The “struths” are made by a long sandbank, which lies in the river parallel to the shore. The “struths” are about half a mile long and 50 yards wide. When the tide is high, the water flows back quickly, leaving the “struths” shallow and plenty of time for fishing.