The Collaborative International Dictionary
thave
thave \thave\ (th[=a]v), n. Same as theave. [Prov. Eng.]
thave
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
thave
n. (context UK dialect English) (alternative form of theave English)
Usage examples of "thave".
Old Un crawled down beside me to make sure that I had set the gun right, for a bad shot would thave meant our death.