three-line whip

== English == === Etymology === From the triple underlining of very important votes on “the whip” — a document detailing upcoming business distributed weekly to British MPs by party managers. === Noun === three-line whip (plural three-line whips) (UK politics) A directive to MPs from party leaders to vote in a particular way in parliament, despite what the MP might believe or what his or her constituents might like. (by extension, humorous) An imperative order. === See also === single-line whip, one-line whip two-line whip, double-line whip