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English definition of “flag”

flag

noun [C]
 
 
/flæɡ/
a piece of cloth, usually rectangular and fixed to a pole at one edge, that has a pattern that shows it represents a country or a group, or has a particular meaning: a container ship sailing under the Indonesian flag
a mark that you put on or against something to show that it is important: You can put a flag on any email message that you know you will need to go back to and read again.
fly the flag to show support for the country, group, or organization that you belong to: The government was accused of failing to fly the flag for British farmers at the negotiations.
(Definition of flag noun from the Cambridge Business English Dictionary © Cambridge University Press)
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