blue Monday

US /bluː ˈmʌn.deɪ/
UK /bluː ˈmʌn.deɪ/
"blue Monday" picture
1.

lundi morose, blues du lundi

a feeling of sadness or depression experienced on a Monday, especially after a weekend of rest or enjoyment

:
I always get that blue Monday feeling after a long holiday.
J'ai toujours ce sentiment de lundi morose après de longues vacances.
Despite the sunny weather, it was a real blue Monday for him.
Malgré le temps ensoleillé, c'était un vrai lundi morose pour lui.