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.
AVAST, adv. Vastly, greatly. Nonce.Ork. 1949 “Lex” But-end Ballans 12:
De bairns'll be grown avast.
[A, pref.1, + Eng. vast.]