Idiom Definition:
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"to see red"  
    to feel very angry
    to feel rage
     
    
Synonyms: 
anger, angered, angry, bent, boiling, crazed, demented, fierce, frenetic, frenzied, frenzy, fume, fuming, incensed, inflamed, infuriated, irate, livid, mad, maddened, rabid, rage, raging, riled, smoking, steamed, upset, vehement, violent, wrathful
 
 
Literally, 
seeing red. - - - - ->  
