A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 1990 (DOST Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
Roust, n.3 (ON rǫst (Norw. røst). Also in the later dial. of Orkney and Shetl. as roust, roost ‘a turbulent stretch of sea caused by a strong current in a restricted passage or by a meeting of conflicting currents, specif. in the seas between Sh. and Ork.’ (SND, s.v. Roust n.).) —1633 (1711) Sibbald's Orkn. & Shetl. 15.
The rousts and high tidegates of the sea about the promontories and the isles, make the weather often rough Ib. 33.
Roust is a tempestuous tyde a1688 An Explication of some Norish Words used in Orkney and Zetland in a1688 Wallace Orkney 110.
Roust, a very tempestuous tide
