Dictionary
Dear sir
noun
Used at the beginning of a formal letter when addressing persons of unknown names.
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"Dear sir" is correct and usable in written English.
You can use it when addressing someone to whom you wish to show respect, such as a business contact, a professor, or someone in a formal setting. For example, "Dear Sir, I am writing to inquire about the job opportunity mentioned in your advertisement."
Exact(34)
Dear Sir: I like words.
"Dear sir. I am nervus.
"Dear Sir," the note reads.
"Dear Sir or Madam," the letter begins.
Dear Sir: Things are back to normal.
"Dear Sir," begins a typical note.
Similar(26)
London;Dear Sir/ I have to lecture at Norwood on the 19th.
London; Dear Sir/ The remittance is all right : there was no question of a presentation.
Gov Throop||Dear Sir,||Please accept my thanks for the loan of your papers.
Dear Sir/Madam, Thanks for writing us an email regarding the "Record Breaking Fail".
Dear Sir/Madam, I'm so glad you came.
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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