rampart
US /ˈræm.pɑːrt/
UK /ˈræm.pɑːrt/
1.
a defensive wall of a castle or walled city, having a broad top with a walkway and typically a stone parapet
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The ancient city was protected by high ramparts.
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Soldiers patrolled the ramparts, keeping watch for enemies.
2.
a defensive or protective barrier
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Education is often seen as a rampart against poverty.
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His strong will served as a rampart against despair.