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Discover LudwigThe phrase 'a blue day' is correct and usable in written English.
It is typically used to refer to a day when one feels depressed, sad or unhappy. For example, "I had a blue day yesterday - nothing seemed to go right."
Exact(21)
What to do about a blue day.
It's a blue day for Cadbury.
"It's a blue day today in the UK," he sighs.
The international success of Born on a Blue Day began a conversation with readers from around the world.
You can't say 'next year".' On a blue day like yesterday, there's really not much else to say.
"Today is a blue day," she explained, taking a tissue out of a magnificent crocheted bag she whipped up over the weekend.
Similar(39)
Under a blue Sunday morning sky, Wyatt Dickson, 34, tends the smoker his parents gave him for his 21st birthday.
It had been a blue Monday for me before I arrived at the symposium, Reimagining the Urban: Bay Area Connections Across the Arts and Public Space, at noon.
There is a Blue monday phenomena but not as we know it.
All-business-class airline La Compagnie is already offering a Blue Friday promotion, with roundtrip fares between New York and Paris for only $1,200.
It may be cool to tell your colleagues that you spent the whole weekend toiling on this or that paper, but your first day after weekend will probably be a blue Monday because you are exhausted.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com