Idiom
Long face.
Someone with a long face is sad or depressed about something.
Dictionary
Long face
noun
An expression of sadness and disappointment or gloom.
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The phrase "long face" is correct and can be used in written English.
Generally, it is used to describe someone who is sad or disappointed. For example, "She had a long face when she heard the news."
Exact(58)
Long face features high forehead, narrow jaw line and long length.
To obscure her long face.
His long face crinkles into a grin.
The aide returned with a long face of apology.
A long face or muzzle is characteristic of wild canines.
Hey, why the long face, Mr. Smooth Fox Terrier?
If I have a long face, there's no point.
Which begs the question -- so, John, why the long face?
It had a long face and big, chunky teeth.
Finally he came to me with a very long face.
Similar(1)
Under negotiation, the two parties engage in (possibly arbitrarily long) face-to-face cheap talk.
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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