Definition of “three-line whip” - English Dictionary

british dictionary

“three-line whip” in British English

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three-line whipnoun [ C usually singular ]

uk /ˌθriː.laɪn ˈwɪp/ us /ˌθriː.laɪn ˈwɪp/

In the UK a three-line whip is an instruction given to Members of Parliament by the leaders of their party telling them they must vote in the way that the party wants them to on a particular subject.

(Definition of “three-line whip” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)