Ayin Horah means that if someone flaunts his fortune, or item of envy, in public, with full awareness that it potentially will cause jealousy, he can be wary that he will be subjegated to the evil effects of A.H.
That is another reason why it is so important to live modestly and simply. People who have the privilege to own expensive cars and beautiful homes should try even harder to be modest in public and try not to show off.
Some wear a red string bracelet to ward off A.H. I asked my LOR for the mekor for that and, after searching, he said it is mentioned in many seforim but couldn’t locate the source.