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.
†TILLIE, n.1 A movable board in the bottom of a boat (Sh. 1866 Edm. Gl., 1908 Jak. (1928)), now only in phr. to move like the sun upon a tillie, to move slowly and steadily (Ib.).
[Norw. dial. tilja, O.N. þilja, plank, floor-board. Cf. Tilfer.]