\Un*breech"\, v. t. [imp. & p. p. {Unbreeched}; p. pr.
& vb. n. {Unbreching}.] [1st pref. un- + breech.]
1. To remove the breeches of; to divest or strip of breeches.
   --Shak.
2. (Gun.) To free the breech of, as a cannon, from its
   fastenings or coverings. --Pennant.