Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BIRL, v.3 (See quot.)n-w Roxb. 1923 Watson W.-B. 56:
Birl, to pick knots, etc., from the surface of (cloth), in finishing its manufacture. Hence Birler, one who does this.