Well, 'to sway (something) for the worst' is an idiom I've never heard, I get what they mean but I don't think it's grammatical, 'for the worse' would sound sli

Well, 'to sway (something) for the worst' is an idiom I've never heard, I get what they mean but I don't think it's grammatical, 'for the worse' would sound slightly better but still not good.