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-A-DAY, int. An exclamation of affirmation; it is indeed, very true, how right you are.Lnk. c.1800 R. Chambers Pop. Rhymes (1870) 389:
“Swat-a-day, aye,” quo' Nelly Paton.