Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
TWITTLE, n. The sound made by a person's fingers in water (Sh. 1905 E.D.D.).
[Imit. Cf. Norw. dial. tvita, to twitter, chatter. But the word may be a mistake for Swittle.]