Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
KO, n. A collection of marbles, see quot.Inv. c.1910 Football Times (28 Aug. 1948):
The proudest boy in town was he who had the largest collection of “durbs”, which he kept in jam jars. The name for this was the “Ko”.