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.
SNAG, n.2 Also snagg. A wooden button. pin or knob, esp. one fixed in a doorpost to keep the door shut, a door-catch (Sh. 1908 Jak. (1928), 1914 Angus Gl., Sh. 1970).
[Norw. dial. snag, sharp point, projection, Icel. snagi, peg.]