Fort
Definition 1 of 4
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Historical Use
The term has a military origin, usually referring to a secure place for troops. The ancient fort had walls thick enough to withstand sieges.
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Figurative Sense
Sometimes used to imply that someone is defensive or hard to approach emotionally. He put up a fort around his heart after the breakup.
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Cultural Heritage
Forts can be historic landmarks and tourist attractions today. We visited the fort, which has been a museum for a century.