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.
†TIRD, n.2 Only in phr. tird and twird, a stipulation in a tenant's lease regarding the cropping of ground (see quot.).Per. 1799 J. Robertson Agric. Per. 64:
By the regulations of old leases, the tenants were restricted not to eff-crop the infield (i.e. not to take two successive crops of oats), nor to fourth crop the outfield till baugh-ley (i.e. ley taithed or watered at six years old). And in very old leases or contracts, the tenants were simply bound to tirds and twirds, which implies the regulation above-mentioned.