- A removable or replaceable protective or insulating cover for an object (eg a book, hot water tank.)
- A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat.
- (military) In ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.
- A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
- (slang) A police record.
- (transitive) To enclose or encase in a jacket or other covering.