1. a Monday on which you feel depressed or unhappy, especially because you have to return to work after the weekend
   • ● Here are six ways to beat those Blue Monday work blues.
   CultureIn Britain, the name Blue Monday is given in particular to the third Monday in January, considered by some to be the most depressing day of the year: Christmas is over, New Year's resolutions have been forgotten and the weather is probably cold and grey.
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[TahlilGaran] English Dictionary ▲

It was blue Monday and John nodded sleepily over his books.

Housewives sometimes wish they could sleep through blue Monday.

[TahlilGaran] English Idioms Dictionary ▲