breachy

Brackish, as applied to water, probably originating in the sea breaking in.

Breachy
·adj Apt to break fences or to break out of pasture; unruly; as, breachy cattle. ...

Webster's Dictionary of the English Language
breachy
A term applied to unruly oxen in New England, particularly to such as break down fences or through i...

Dictionary of American Words And Phrases by John Russell Bartlett.