Sally port Meaning, Definition & Usage

Definitions
  1. . (a) (Fort.) A postern gate, or a passage underground, from the inner to the outer works, to afford free egress for troops in a sortie . (b) (Naval) A large port on each quarter of a fireship, for the escape of the men into boats when the train is fired; a large port in an old-fashioned three-decker or a large modern ironclad.

Webster 1913