red wave
Noun
Meaning
red wave (plural red waves)
(US politics) A surge of voters supporting the candidates of the Republican Party during an election (especially a midterm election), which results in the party making significant gains.
Coordinate term: blue wave
Examples
And President Donald Trump, crediting "the Trump impact," said there might be "a big Red Wave" instead.
President Donald Trump is congratulating Republican John Cox for his second-place finish in California's primary for governor, saying the "Trump impact was really big" and predicting a possible "big Red Wave" of Republican wins.