Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
I subscribe to the view that people mispronouncing things have read more stuff rather than heard things, so of course I’m not looking down on them for that. I didn’t realize until recently that quinoa wasn’t kwin-OH-ah for awhile, or even in my youthful fondness for Greek myths that the goddess wasn’t called ah-fro-DAIT.
Another big one is “conscience”. How could that be read as anything but “con science?”
English pronunciation is completely all over the place, so much so that you frequently cannot predict how a word is supposed to be pronounced. I usually don’t pay too much attention to pronunciation errors because of that.