A term applied to unruly oxen in New England, particularly to such as break down fences or through inclosures. It is provincial in the South of England in the same sense.--Halliwell's Arch. and Prov. Dic.
·adj Apt to break fences or to break out of pasture; unruly; as, breachy cattle. ...
Webster's Dictionary of the English Language
Brackish, as applied to water, probably originating in the sea breaking in. ...
The Sailor's Word-Book