From Longman Dictionary of Contemporary Englishtake the (moral) high roadtake the (moral) high roadAmerican English to do what you believe is right according to your beliefs Daley has taken the high road in his campaign. → high road
Examples from the Corpus
take the (moral) high road• Daley has taken the high road in his campaign, trying to ignore Merriam's attacks.• Read in studio Still to come on Central News, taking the high road.• She was at least making the attempt to take the high road, only to run into a dead end.• Instead, I decided to take the high road. 