Wiktionary
n. (context politics English) an overwhelming victory in an election
Wikipedia
A landslide victory is an electoral victory in a political system, when one candidate or party receives an overwhelming majority of the votes or seats in the elected body, thus all but utterly eliminating the opponents. The winning party has reached more voters than usual, and a landslide victory is often seen in hindsight as a turning point in people's views on political matters.
Part of the reason for a landslide victory is sometimes a bandwagon effect, as a significant number of people may decide to vote for the party which is in the lead in the pre-election opinion polls, regardless of its politics.
The term is borrowed from geology, where a landslide takes almost everything with it on its way.
Usage examples of "landslide victory".
This is not the ideal audience for a second-term president, fresh from a landslide victory, to confront with 29 minutes of lame gibberish about mean nit-pickers in Congress, the good ole American way, and Let's Get on with Business.
If he blew it, which was more than likely, that three-vote margin over Pancho Armijo every two years could dissolve into a landslide victory for his opponent.
The vast majority that had carried Lyndon Johnson to his landslide victory in 1964 was beginning to unravel.
In 1972, before the Watergate thing got out of hand, right after you got a peace treaty from the Vietnamese and right after your landslide victory.
Died in 2288 on the day that he won another term in a landslide victory.