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In parliamentary practice, previous question is the question whether a vote shall be taken on the main issue or not, brought forward before the main question is put by the Speaker.
The great remedy against prolix or obstructive debate is the so called previous question, which is moved in the form, "Shall the main question be now put?" and when ordered closes forthwith all debate, and brings the House to a direct vote on that main question. ... Closure by previous question, first established in 1811, is in daily use, and is considered so essential to the progress of business that I never found any member or official willing to dispense with it. Even the senators, who object to its introduction into their own much smaller chamber, agree that it must exist in a large body like the House. [James Bryce, "The American Commonwealth," vol. I., 1893]