French
Avoir le cafard
/ah-vwahr luh kah-fahr/
To feel down, depressed, or have the blues. It describes a state of low spirits, sadness, or melancholy without a specific, identifiable cause. It's a general feeling of gloominess.
Lit. to have the cockroach
This idiom is used to describe a mood or feeling of sadness or despondency that isn't necessarily tied to a particular event. It's often used when someone is feeling generally unhappy or listless. For example, 'Je ne sais pas pourquoi, mais j'ai le cafard aujourd'hui.' (I don't know why, but I have the blues today.)