Definition of flag verb from the Oxford Advanced Learner's Dictionary

     

    flag

     verb
    verb
    BrE BrE//flæɡ//
     
    ; NAmE NAmE//flæɡ//
     
    Verb Forms present simple I / you / we / they flag
    BrE BrE//flæɡ//
     
    ; NAmE NAmE//flæɡ//
     
    he / she / it flags
    BrE BrE//flæɡz//
     
    ; NAmE NAmE//flæɡz//
     
    past simple flagged
    BrE BrE//flæɡd//
     
    ; NAmE NAmE//flæɡd//
     
    past participle flagged
    BrE BrE//flæɡd//
     
    ; NAmE NAmE//flæɡd//
     
    -ing form flagging
    BrE BrE//ˈflæɡɪŋ//
     
    ; NAmE NAmE//ˈflæɡɪŋ//
     
     
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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 had never flagged. flagging support/enthusiasm More Like This Consonant-doubling verbs bob, club, dub, grab, rub, sob, throb kid, nod, pad, plod, prod, shred, skid, thud beg, blog, bug, drag, drug, flag, hug, jog, log, mug, nag, plug bar, confer, infer, occur, prefer, refer, star, stir, transfer acquit, admit, allot, chat, clot, commit, jut, knit, pat, regret, rot, spot, submit (in British English:) appal, cancel, channel, control, counsel, enrol, equal, excel, fuel, fulfil, label, level, marvel, model, pedal, quarrel, signal, travelSee worksheet.
  3. Word Originverb sense 1 mid 16th cent.: perhaps from obsolete flag ‘drooping’, of unknown ultimate origin. verb sense 2 mid 16th cent. (in the sense ‘flap about loosely, hang down’): related to obsolete flag ‘hanging down’. Phrasal Verbsflag down somebodyflag somethingup
See the Oxford Advanced American Dictionary entry: flag