blue Monday

American  

noun

1. a Monday regarded as a depressing workday in contrast to the pleasant relaxation of the weekend.

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Example Sentences

There is a reason it is called Blue Monday.

From BBC

The facility, which will run the sessions until Easter, was also taking part in "brew Monday" on 19 January, often referred to as blue Monday.

From BBC

The set would have been incredible enough on its own, gracefully fitting “Sub-Culture,” “Bizarre Love Triangle,” “True Faith” and “Blue Monday” into a one-hour window, but the group brought more than that to the table.

From Los Angeles Times

On 20 January, or Blue Monday - dubbed by some as the most depressing day of the year - the couple sent a voice note to BBC Radio Leicester, when listeners were asked what they had to be cheerful about.

From BBC

I was thinking about the Blue Monday phenomenon - the January day that is said to be the saddest of the year.

From BBC