three-line whip noun2 •(UK) A directive to MPs from party leaders to attend a parliamentary meeting and vote in a particular way, despite what the MP might believe or what his or her constituents might like.Deputy Chief Whip Craig Whittaker told them it will be a “100% hard” three-line whip, saying: “This is not a motion on fracking. This is a confidence motion in the Government.” — 2022 •(humorous) An imperative order.I have to go shopping with the wife, I'm afraid. She's given me a three-line whip. formsthree-line whips
