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Noun: three-line whip
Usage: UK
  1. A directive to MPs of a political party to attend parliament and vote in a particular way
    "The party leader issued a three-line whip for the crucial Brexit vote"
     
  2. An order to attend or do something, with no excuses
    "The CEO put out a three-line whip for all executives to attend the emergency meeting"

Derived forms: three-line whips

Encyclopedia: Three-line whip