to divide (an area) into election districts to give one political party an electoral advantage
to manipulate or alter (something) to give oneself an advantage
gerrymanderer noun
gerrymandering noun
named after Elbridge Gerry d.1814, US statesman + salamander; from the shape of an election district formed during Gerry's governorship of Massachusetts, which favoured his own party. A map of the district, with wings, claws, and teeth added, was published in a Boston newspaper in 1812