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.
JIB, n.2 A protective leather covering for a stone-mason's left thumb, used to prevent chafing by the chisel (Rxb. 1923 Watson W.-B.; Fif. 1953).
[From its triangular shape, like a jib-sail.]
