Definition of flag verb from the Oxford Advanced American Dictionary

     

    flag

     verb
    verb
    NAmE//flæɡ//
     
    Verb Forms present simple I / you / we / they flag
     
    he / she / it flags
     
    past simple flagged
     
    -ing form flagging
     
     
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  1. 1[transitive] flag something to put a special mark next to information that you think is important I've flagged the paragraphs that we need to look at in more detail.
  2. 2 [intransitive] to become tired, weaker, or less enthusiastic It had been a long day and the children were beginning to flag. Her confidence never flagged. flagging support/enthusiasm
  3. Phrasal Verbsflag somebody/somethingdown
See the Oxford Advanced Learner's Dictionary entry: flag