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.
†SWEG, n. Also sw(e)ig. A quantity, a considerable number (Lth. 1808 Jam.); also as a variant of Eng. swig, a long drink of liquor, a “pull” (Sc. 1825 Jam.).
[Poss. the first meaning is an extended or transferred usage of the second. ]