'cork jacket' definitions:

Definition of 'cork jacket'

noun

Life preserver consisting of a sleeveless jacket of buoyant or inflatable design [syn: life jacket, life vest, cork jacket]

From: GCIDE

Jacket \Jack"et\, n. [F. jaquette, dim. of jaque. See 3d Jack, n.] [1913 Webster]
1. A short upper garment, extending downward to the hips; a short coat without skirts. [1913 Webster]
2. An outer covering for anything, esp. a covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, etc. [1913 Webster]
3. (Mil.) In ordnance, a strengthening band surrounding and re["e]nforcing the tube in which the charge is fired. [1913 Webster]
4. A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket. [1913 Webster]
Blue jacket. (Naut.) See under Blue.
Steam jacket, a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle.
To dust one's jacket, to give one a beating. [Colloq.] [1913 Webster]