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.
WOW, v.2 To wave, signal by waving, beckon. [wʌu]Gall. 1824 MacTaggart Gallov. Encycl. 309, 481:
I wow'd wi' my hat. . . . Whan I wow stan fast.