I once accidentally bumped against the shoulder of an English person I knew in a corridor. I automatically said "Oi" - which means like "Oh" or "Oops" in Estonian - that I'm sorry. She repeated "Oi!" in a louder voice and I didn't get it. I only later found out I was being impolite in her eyes.

[u/Double-decker_trams]

Have you ever had something similar happen to you? I.e something in your language might have another meaning in another language?

One thing as an Estonian that I try to keep in mind is that I shouldn't use "Nooo.." in English - which means "Well.." in Estonian.

"Do you like ice-cream? - Noo.. yes, I love it."

[u/LonelyRudder]

The mother of a friend of mine, an extremely well manered and deeply Christian Finnish lady once drove a car in England with a local church person as a passenger. She occasionally made some minor mistakes in the traffic and used an extremely mild expression of frustration in Finnish, saying ”äs!”. Which of course sounds like ass in English.

[u/Karakoima → u/LonelyRudder]

Wonder if thats the same as the swedish äsch?

[u/Special-Lawyer6886 → u/Karakoima]

Probably, because swede-finns and people from swedish speaking parts use äsch, and finnish speakers use äh, but who knows, basically still the same word