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 always think of that one in the same sense of famous and infamous. My brain accepts that only as inflammable things are REALLY flammable.
And even then my brain needs a second to recover from the 180 I mentally have to do to make that make sense.