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.
JAMMER, n. A term employed in the game of marbles for an opponent's marble lying in the direct line to the hole and blocking access to it (Uls.4 1947).Edb. 1910 Scotsman (9 Sept.):
“Heavens! Thaut's a Jammer.” — You cannot hit it — in game of marbles.