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The Collaborative International Dictionary
Theave

Theave \Theave\, n. [Cf. W. dafad a sheep, ewe.] A ewe lamb of the first year; also, a sheep three years old. [Written also thave.] [Prov. Eng.]
--Halliwell.

Wiktionary
theave

n. 1 (context UK dialect English) A ewe lamb of the first year. 2 (context UK dialect English) A sheep three years old.