transitive verb Date: 1742 to collect or keep together (members of a political party) for legislative action, to keep (hounds in a pack) from scattering by use of a whip
WHIP IN
Meaning of WHIP IN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012