Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
AGO, adv. The use of ago with since, once St.Eng., is marked as a Scotticism by Mitchell, and may still be heard in Sc. (and in Eng.: see Fowler, Mod.Eng. Usage, s.v.).Sc. 1799 H. Mitchell Scotticisms 14:
It is ten years ago since he died.
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"Ago adv.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 25 Sep 2022 <http://www.dsl.ac.uk/entry/snd/ago>