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.
†TERRA, int. A call to urge on a dog.Rxb. c.1800 Mem. S. Sibbald (Hett 1926) 200:
“Ter-r-ra, ter-r-ra,” which he called out as long as the dog was to go straight on.