Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
AITH, v. To swear, use profane language or oaths. Cf. Aith, n.1Mry. 1922 Swatches o' Hamespun 31:
The Younkers jump in their delight Tae hear the auld man aithin'.