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.
SWAT, v.2, n. Sc. variant of Eng. school slang swot, to study hard, a close student. See P.L.D. § 54.Per. 1901 I. Maclaren Young Barbarians i., viii.:
A lad who played no games and swatted all evening. . . . In the company of half a dozen “swats.”