Definitions from Wiktionary (jacket)

▸ noun:  A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
▸ noun:  A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)
▸ noun:  A protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)
▸ noun:  (slang) A police record.
▸ noun:  (military) In ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.
▸ noun:  The tough outer skin of a baked potato.
▸ noun:  (Jamaica) A bastard child, in particular one whose father is unaware that he is not the child’s biological father.
▸ noun:  (Appalachia) A vest (US); a waistcoat (UK).
▸ verb:  To confine (someone) to a straitjacket.
▸ verb:  (transitive) To enclose or encase in a jacket or other covering.

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