feel blue(redirected from feeling blue)
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To feel sad, somber, or glum. I have been feeling blue lately, but I think it's just because of this gloomy weather we've been having.
Fig. to feel sad. You look like you feel blue. What's wrong?
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.