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The phrase "a flag on" is correct and usable in written English.
It can be used in contexts where you want to indicate a warning, alert, or a point of concern regarding a specific issue or situation.
Example: "There is a flag on the report that indicates potential discrepancies in the data."
Alternatives: "a warning about" or "an alert regarding".
Exact(59)
After you place your order, you're given a number on a stick, which you plant like a flag on one of those tables.
The game can also end when your friend places a flag on every one of your mines.
Plus, when we finally plant a flag on Mars, it better be a good one.
That's when I noticed these two guys on the roof, one of whom was leading the birds with a flag on the end of a very long pole.
Auburn lore maintains that one of those colleagues -- John W. Young and Charlie Duke -- deposited a flag on the lunar surface.
Sovereign put a flag on the account.
"I was hoping they didn't throw a flag on it.
Livingstone lowered a flag on the Members' Terrace.
It's like putting a flag on the Moon".
You got me flipping like a flag on a pole.
Somebody needs to throw a flag on this play".
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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