What does flag up mean? Is it an idiom?

[Edda]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #24 "Idioms with phrasal verbs", question 10

Before the meeting officially starts I'd like to flag up one or two points.

(a) finish
(b) mention
(c) tell
(d) say

English Idioms and Expressions, Advanced Level

ESL/EFL Test #24 "Idioms with phrasal verbs", answer 10

Before the meeting officially starts I'd like to mention one or two points.

Correct answer: (b) mention
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FLAG UP?

Edda

[Alan]

Hi Edda,

'Flag up' is an idiom that comes from the idea of using a flag to show what you want to say. In the context of the sentence in the test it means draw someone's attention to a particular point or points.

Alan
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English as a Second Language
You can read my ESL story Indirect Speech