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.
¶THRAVIN, n An interval or temporary break in bad weather (Mry. 1914 Trans. Bnff. Field Club 28). Cf. Dally, n.2
[Orig. somewhat uncertain, phs. vbl.n. from thraave, Thraw, sc. a turning or alteration. Cf. rain-thraw s.v. Thraw, n., 1. Combs. (4).]