flag up meaning

flag up sth BrE to attract people's attention to a particular idea, subject etc, or inform them about it:
▪ The conference was an opportunity to flag up Scottish concerns across the European Parliamentary scene.

• flag:    Noun: flag &n ...
• american flag:    Noun: American fla ...
• battle flag:    Noun: battle flag& ...

Examples

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1. It flags up so many missing citations it's fascinating.
2. Freshman Kim Zanone, 15, voted to keep the flag up.
3. There were always flags up, and nobody said boo,
4. You had wires down, but no warning flags up,
5. Notice that she puts the flag up on the box.