Top Definition
A tool used in the British Parliamentry system to undermine democracy.

The term refers to to party 'enforcers' or whips underlining an item on parliamentry order papers three times as an order for all MP's to tow the party line on that vote even if the party line goes against their own beliefs and the wishes of their electorate.
see also Withdrawing the whip
Britains involvment in Gulf War 2 war as a result of a three line whip
by black flag June 05, 2004

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