1. a temporary or supplementary fortification, typically square or polygonal and without flanking defenses
Usage: military
2. a secure retreat or stronghold

Examples

• The soldiers built a redoubt on the hilltop to defend against enemy attacks.
• The ancient redoubt still stands as a reminder of past battles.
• They retreated to their mountain redoubt when the city fell.
• The rebel forces established a redoubt in the forest.
• The coastal redoubt protected the harbor from naval assault.
• His study became his redoubt where he could work undisturbed.