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”.
The quiet (silent) part isn’t normally said. That’s why the meaning is “you’re saying all the parts out loud together, even the parts that are supposed to be silent/quiet”. There was no indication that the “quiet part” was a verbal expression before the “out loud” modifier.