A small rear gate, particularly one out of a fort or palace.
A back-gate, backdoor, part entry, or any other portal distinct from primary entry.
By extension, a different or hidden way in or out-of someplace, scenario etc.
Originally, a back door or gate; an exclusive entrance; for this reason, any little door or gate.
A subterraneous passageway interacting between your parade and the main ditch, or amongst the ditches and the inside associated with the outworks.
A back door or gate; a private entrance; for this reason, any small home or gate. See cuts under castle and barbican.
In fortification, a covered passageway shut by a gate, typically within the position associated with the flank of a bastion, or perhaps in that the curtain, or close to the orillion, descending to the ditch.