feel blue

Idioms  

1. Be depressed or sad, as in I was really feeling blue after she told me she was leaving. The use of blue to mean “sad” dates from the late 1300s. See also blue funk, def. 2; have the blues.

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Example Sentences

So if there is a dip, investors shouldn’t feel blue but embrace the yellow metal.

From Barron's • Oct. 16, 2025

Throw in some hormonal mayhem, and it’s no wonder the women in the book feel blue.

From Washington Post • Feb. 6, 2020

Here I recognize myself again: to this day, when I feel blue I console myself by thinking of someone who is worse off than I am.

From The New Yorker • Sep. 9, 2019

An example is the Winter Sky Shell, with flavor text "For Ghosts who feel blue"; it aids XP and / or reputation gain, and other shells do too.

From The Verge • Aug. 19, 2015

Even the faint odor of carbolic acid, compounded with that of other unknown chemicals, was enough to make a man feel blue.

From The Brute by Kummer, Frederic Arnold