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.
¶THIRRAP, n. A kink or tangle in a net or rope (Abd. 1952). [θɪrəp]
[Poss. a reduced form of Thraw, a twist, + Raip. See thraw-raip s.v. Thraw, v., 9.(20).]