Noun
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
And President Donald Trump, crediting "the Trump impact," said there might be "a big Red Wave" instead. Source: Internet
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. Source: Internet