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.
SWA, n. The amount of hay or corn cut by a scythe at one sweep (Ayr. 1923 Wilson Dial. Burns 188). [swǫ:]
[A reduced form of Eng. swath, id., prob. by a back-formation from the pl. [swɑ: ðz > swɑ: z]. Cf. Scree.]