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.
YO, adv. Used as a strong affirmative, in correcting another speaker's no, but yes (I., ne.Sc., Per. 1974). Cf. Fr. si, Norw., Dan. jo.Bnff. 1956 Banffshire Adv. (11 Oct.) 8:
“Nae that muckle o' a grudge.” “Oh bit yo.” “Oh bit no.” “Oh bit yo yo.”