Blue

The color blue has been mentioned in several songs in Lover:

"If you cascade, ocean wave blues come."-"peace"

"We're so sad, we paint the town blue," -"Miss Americana and the Heartbreak Prince"

"You know I like Springsteen, faded blue jeans," -"London Boy"

"I'm with you even if it makes me blue... that color we painted your brother's wall" -"Paper Rings"

"Lyrical smile, indigo eyes," -"I Think He Knows"

"I blew things out of proportion, now you're blue," -"Afterglow"

"My heart’s been borrowed and yours has been blue," -"Lover"

"The feeling I've got, it's blue, -"Cruel Summer"

"And everything is icey and blue," -"Christmas Tree Farm-Single"

"Oh d***, never seen that colour blue."-"Delicate"

“Gave me the blues and then purple pink skies.”-“invisible string”

“You’ll spend your whole life singin’ the blues if you keep thinkin’ that way.”-“Starlight”

“Don’t want no other shade of blue but you,” -“hoax”

"Deep blue, but you painted me golden."-"Dancing With Our Hands Tied"

Also, on the cover for Lover, the tips of her hair is dyed blue. Plus, she is an active Democrat, and their color is blue. What does blue mean to Taylor Swift?

In the “Red”, she sings "Losing him was blue like I'd never known, missing him was dark grey, all alone...but loving him was red.” We have learned that not only in Lover, but in all of her albums, Taylor uses the word blue quite frequently. She mentions other colors as well.

In “Daylight”, she says "I once believed that love could be burning red," as a reference to the line from “Red” above, "but it's golden," meaning that her views of the essential idea that love brings across have changed, and hinting at her possible emotion/colour synesthesia, which has never been fully revealed, but hinted at multiple times. Red could also mean hate, as in "Look What You Made Me Do" she sings, "I've got a list of names and yours is in red underlined." She references golden:

"One single thread of gold tied me to you."-"invisible string"

"Gold was the color of the leaves"-"invisible string"

"It's like your body is gold."-"End Game"

She references black and white a few times too. In "Out of The Woods," she sings, "The rest of the world was black and white but we were in screaming color." In "Daylight" she sings, "I once believed love would be black and white," and in "Getaway Car" she sings, "The ties were black, the lies were white. Shades of grey in candlelight"