Definition of blue adjective from the Oxford Advanced Learner's Dictionary

      

    blue

     adjective
    adjective
    BrE BrE//bluː//
     
    ; NAmE NAmE//bluː//
     
    (bluer, bluest) Unhappiness
     
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  1. 1  having the colour of a clear sky or the sea/ocean on a clear day piercing blue eyes a blue shirt a navy blue jumper her vivid blue eyes
  2. 2  (of a person or part of the body) looking slightly blue in colour because the person is cold or cannot breathe easily Her hands were blue with cold.
  3. 3(informal) sad synonym depressed He'd been feeling blue all week. See related entries: Unhappiness
  4. 4films/movies, jokes or stories that are blue are about sex a blue movie
  5. 5 (politics) (of an area in the US) having more people who vote for the Democratic candidate than the Republican one blue states/counties opposite red
  6. see also true-blue
    Word Origin Middle English: from Old French bleu, ultimately of Germanic origin and related to Old English blǣwen ‘blue’ and Old Norse blár ‘dark blue’.Idioms
    between the devil and the deep blue sea
     
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    in a difficult situation where there are two equally unpleasant or unacceptable choices
    (beat somebody) black and blue
     
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    (to hit somebody until they are) covered with bruises (= blue, brown or purple marks on the body) More Like This Alliteration in idioms belt and braces, black and blue, born and bred, chalk and cheese, chop and change, done and dusted, down and dirty, in dribs and drabs, eat somebody out of house and home, facts and figures, fast and furious, first and foremost, forgive and forget, hale and hearty, hem and haw, kith and kin, mix and match, part and parcel, puff and pant, to rack and ruin, rant and rave, risk life and limb, short and sweet, signed and sealed, spic and span, through thick and thin, this and that, top and tail, tried and tested, wax and waneSee worksheet.
    do something till you are blue in the face
     
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    (informal) to try to do something as hard and as long as you possibly can but without success You can argue till you're blue in the face, but you won't change my mind.
    (informal) very rarely
    scream blue murder(British English)(North American English scream bloody murder)
     
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    to scream loudly and for a long time, especially in order to protest about something
See the Oxford Advanced American Dictionary entry: blue