redoubt

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. (military) a temporary or supplementary fortification;
typically square or polygonal without flanking defenses
• Topics:
military, armed forces, armed services, military machine, war machine
• Hypernyms:
fortification, munition
2. an entrenched stronghold or refuge
• Hypernyms:
stronghold, fastness