What is the origin of the idiom "read my lips" and when to use it?

The idiom "read my lips" has its origins in the English language, and it is used to emphasize the importance of a statement, underscoring that what is being said is clear, definite, and should not be misinterpreted. While the exact historical origin of the phrase is not precisely documented, it has been in use as a figurative expression for many years.