1. the back part of a gun barrel where ammunition is loaded
2. the buttocks or rear end
Usage: informal
3. the lower part or back end of something

1. to put breeches or pants on someone
Usage: archaic

Examples

• The soldier loaded the cartridge into the breech of his rifle.
• The cannon’s breech was damaged in the explosion.
• The baby was delivered in a breech position.
• He fell and landed hard on his breech.
• The breech of the ship was reinforced with steel plates.
• In medieval times, servants would breech young boys when they came of age.