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.
DWALLOW, v. Nonce form of Wallow, to decay, wither, fade away, altered for assonance with dwine.Ayr. 1833 Galt Eben Erskine I. ix.:
It's a common case with young men to dwine and dwallow when they first come to the College.