Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
†COOPERMAN, v. “To play; to play into each other's hands in an unjust manner” (Bnff. 1866 Gregor D. Bnff. 30).
[Prob. from Couper, n.1, q.v.]