Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
SICK, n.2 A familiar abbreviation for sixpence (Fif. c.1850 Peattie MS.), common in dim. form sickie, sikey (Kcd., Ags., Fif. 1970).Ags. 1903 Arbroath Guide (14 March) 3:
To joogle a sikey oot o' Marget's kennin.