rule of engagement

/R UW1 L AH0 V EH0 N G EY0 JH M AH0 N T/
noun
  1. 1

    (military, law enforcement, chiefly in the plural) An internal rule among a military, police, etc. force defining the circumstances in which and manner with which to use force.

  2. 2

    (figurative, transferred sense) An implied set of rules for when to undertake a certain approach.

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