Definition of high ground noun from the Oxford Advanced American Dictionary

 

high ground

 noun
noun
 
the high ground[singular]
 
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  • the advantage in a discussion or an argument, etc. The government is claiming the high ground in the education debate.
  • Idioms
    take, claim, seize, etc. the moral high ground
     
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    to claim that your side of an argument is morally better than your opponent's side; to argue in a way that makes your side seem morally better
    See the Oxford Advanced Learner's Dictionary entry: high ground