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.
TICHER, v. Also tigher. To laugh in a suppressed way, to titter (Ayr. 1825 Jam.). [′tɪxər]
[Orig. chiefly imit., conflated from Kicher, v.2, and titter.]