[ghaff]

I’m not sure the meanings are really different. It’s just that tariff usually refers to import duties in the US.

People arguing that’s the only US meaning are just wrong though

[locallost]

But that's normal for languages, the meaning of a word can adjust to the point a meaning previously used becomes archaic. It's obvious these two words share the same for lack of a better word gist, but the actual usage diverged later.