Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
LETT, n.2 Given by Jam.2 for Abd. as “a lesson, a piece of instruction, gen. conjoined with an adj. expressive of vituperation”, is prob. an erroneous definition of Lait, n., arising from such phrs. as “to learn ill laits.”