Fort up

verb, slang

Definitions

Verb
  1. 1
    To fortify (a place); to convert into a fort. informal, transitive

    "They had forted up their house, cutting the bottom-land timbers, lopping off their limbs, and driving the tree trunks into the ground topwise, to make a stockade big enough to hold them and some neighbors — the ones willing to stay there."

  2. 2
    gather in, or as if in, a fort, as for protection or defense wordnet

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