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.
¶MUSH, n.4 “One who goes between a lover and his mistress to make up a match” (Fif. 1808 Jam.).
[Orig. doubtful.? From Mush, n.2]