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Raise red flags?

Posted by TheFallen on May 23, 2003

In Reply to: Raise red flags? posted by Nina on May 23, 2003

: Please look at this sentence,"this document is sufficient to raise red flags,but additional details were required".Does it mean that this document is sufficient to call for people's vigilance?
: Thank you for your help!

To "raise a red flag" is to alert as to potential danger or trouble ahead, the origin being that red flags are often literally used to warn people of possible peril. Therefore yes, you're right - the document in question contained enough information to put the reader on his guard, but to be absolutely sure if his fears were justified, he required more details.