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

The Winter Sky Shell is "for Ghosts who feel blue"

From The Verge • Aug. 19, 2015

In fact, they were so elated over the great success that had rewarded their daring venture that it seemed just then as if nothing could ever again make them feel blue, or depressed in spirits.

From Air Service Boys over the Atlantic by Beach, Charles Amory