letters of marque

noun
  1. 1

    An official commission from a government authorizing someone to seize the property or people of another nation; especially to attack merchant shipping of another nation.

  2. 2

    A ship that has been armed for such a task.

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Source: https://en.wiktionary.org/wiki/letter%20of%20marque, https://en.wiktionary.org/wiki/letters%20of%20marque