Scottish National Dictionary (1700–)
CO', Ko, v., pa.t. Quoth, said. Most common in Ork., but known in many other districts of Scotland. Bnff.2, Abd.19, Fif.10 1936 give it as still known, but Watson in Rxb. W.-B. (1923) gives it as obsol. Angus Gl. (1914) gives ko for Shet. [ko]
Ork. 1915 J. T. S. Leask in Old-Lore Misc., Ork., Sh., etc. VIII. i. 42:
Och! co da trucker, sheu wad be blide tae deu dat. Abd. 1768 A. Ross Helenore 62:
What was the case, my lass, gin I meith speer? That, co' the other, ye right now shall hear. Lnk. c.1779 D. Graham Writings (1883) II. 222:
Haith, co' Maggy, I'll singe the woo' aff't.
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"Co' v., p.t.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 22 Sep 2018 <http://www.dsl.ac.uk/entry/snd/co_v_pt>
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