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The phrase "hot line" is correct and can be used in written English.
It refers to a direct and immediate means of communication between two parties, usually for urgent or emergency purposes. Example: The company set up a hot line for customers to report any issues with their products.
Dictionary
hot line
noun
Alternative spelling of hotline
Exact(53)
A hot line was established.
Call the TIPS hot line".
"There's not even a hot line".
Call your insurer's nurse triage hot line.
His office has a hot line.
Someone, finally, called the hantavirus hot line.
The two countries maintain a military hot line.
Similar(4)
A terrorism hot-line might have been closed.
"Everyone here is overwhelmed," one hot-line volunteer said.
A hot-line operator keeps a log of violent incidents.
Moscow spy-hot-line phone number not divulged: subject explained it is unlisted.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com