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Phrase(s): Absolute power corrupts absolutely.
Prov. One who has total authority is very likely to abuse his position. (This phrase was used by the British historian Lord Acton: "Power tends to corrupt and absolute power corrupts absolutely.") • We thought that Johnson would be a responsible mayor, but within a year of taking office, he was as bad as all the rest. Absolute power corrupts absolutely.
McGrawhill's American Idioms And Phrasal Verbs