Earlier quoted context omitted.
> Ah, the "achaar". So wrongly translated as "pickle". Why do you say that? I wrote a longer reply here to someone saying the same, but in brief my guess is that you're thinking of (US) 'dill pickle'? https://news.ycombinator.com/item?id=37725552 Nimbu achar is called lime pickle in the UK. That doesn't seem strange and nobody's surprised at what they get, so why is it 'so wrongly translated'?
Pickle is definitely the right word. Achar is a Persian loan word in Hindi. There's no good reason to use that as a standard term when writing in English. Both pickle and achar would sound alien to my great-grandparents, who spoke neither English nor Hindi. They would use the term uppinakaayi. https://en.wikipedia.org/wiki/South_Asian_pickle
I don't know what they think would be a better translation (i.e. explicitly not just borrowing achar ourselves too) - salsa maybe? Seems weird to use a loan word from a completely different culture for a different preserve, and anyway I suspect Britain had achar before salsa.
(^Anyway you would never say 'pass the pickle' for pickled onions, maybe something like piccalilli, which is relatively achar like! Although I'm not sure how good an argument that is, it probably was colonially achar-inspired, heavily uses yellow mustard seed which I think isn't/wasn't cultivated here (for harvest of seeds for culinary use I mean).)