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.
SUISS, v. To speak with a hissing sibilant sound (Rxb. 1923 Watson W.-B., Rxb. 1971). [søs]
[Imit. Cf. n.Eng. dial. siss, to hiss.]