I grew up familiar with "do the needful", which I still use. I also grew up many thousands of miles from India. But my favorite Indian expression, which I learn

I grew up familiar with "do the needful", which I still use. I also grew up many thousands of miles from India. But my favorite Indian expression, which I learned later is to "prepone" something, as in the opposite of to "postpone" something. That one, I genuinely love. Neither of these are slang, like "ute" or "arvo", they're a thoughtful evolution of the language.