high ground
noun
Britannica Dictionary definition of HIGH GROUND
the high ground
:
a position in which you have an advantage over others
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often used in the phase the moral high ground
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These countries lost/ceded the moral high ground [=they stopped being morally better than others; they lost the right to consider themselves morally better than others] when they entered the war to protect their economic interests.
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She believes she has the moral high ground on this issue. [=she believes her position on the issue is the morally correct one]