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evil triumphs when good men do nothing
Inaction against evil allows it to continue or proliferate. Now that we know the CEO is stealing money from his clients, we need to do something about it. Evil triumphs when good men do nothing. Have we learned nothing from the Holocaust? Evil triumphs when good men do nothing.
triumph over (one)
To defeat or be victorious over someone or something. Though considered an underdog since the beginning of the season, the young team triumphed over all and claimed the championship for themselves. I just don't see divorce as something in which one side needs to triumph over the other—in this situation, we both lose. It's a heartwarming tale of a young woman triumphing over adversity.
*better of someoneand *the best of someone
triumph over someone. (*Typically: get ~; have ~.) Bill got the best of John in the boxing match. I tried to get the better of Tom in the golf match, but he won anyway.
triumph over someone or something
to achieve victory over someone or something. Our team triumphed over all the others. Our army triumphed over theirs.
To defeat someone or something, especially in a noteworthy contest: By the end of the movie, good triumphs over evil and everybody is happy.