vent

A slit in a garment, as in the back seam of a jacket.

Forceful expression or release of pent-up thoughts or feelings.

An opening permitting the escape of fumes, a liquid, a gas, or steam.

The small hole at the breech of a gun through which the charge is ignited.

The excretory opening of the digestive tract in animals such as birds, reptiles, amphibians, and fish.