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.
SPROG, v. Also sproag. To go on a nocturnal courting expedition, to make love under cover of night. [sprog]Gall. 1824 MacTaggart Gallov. Encycl. 71, 228, 435:
Mony hied there a sprogan at een, Haunts of poets, and people a sproaging. Sproaging, running after girls under night.