This morning, when I opened up my Twitter account, I discovered a reference to a certain US multinational famous for its milk and cocoa products, Milka.
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Once upon a time, even innocent kids in English-speaking communities would have known that a trend can be either up or down, positive or negative. It doesn't necessarily imply that things are getting better. For example: “There’s a nasty trend among children in slum schools to become bullies.” Or, more succinctly: “In slum schools, bulliness is trending.” Just like Milka. Or Trump, on that fateful election day.