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.
¶SWEIG, n. Also sweeg. A very bad candle, one made from the dregs of the tallow (Rxb. 1825 Jam.). Cf. water-wader s.v. Water.
[Orig. obscure.]