Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BESTUMM, v. To astonish, amaze. [bɪ′stʌm]Cai.9 1949:
Hid fair bestummd me at fowkies still kent sic wirds.
[Be, pref., + colloq. Eng. stump, to perplex. The word is a recent formation.]