Webster's Revised Unabridged Dictionary · 1913

Unbreech

Unbreech , transitive verb

[1st pref. un- + breech.]

1.
To remove the breeches of; to divest or strip of breeches. — Shakespeare
2.
(Gunnery) To free the breech of, as a cannon, from its fastenings or coverings. — Pennant