fortress
US /ˈfɔːr.trəs/
UK /ˈfɔːr.trəs/
1.
a military stronghold, especially a strongly fortified town fit for a large garrison
:
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The ancient fortress stood proudly on the hill, guarding the city below.
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The rebels retreated to their mountain fortress.
2.
a place that is protected against attack
:
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His home was his personal fortress, a sanctuary from the outside world.
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The company built a financial fortress to withstand economic downturns.