[shift] {one's} ground

to adopt a different opinion or point of view, particularly a contradictory one

The idiom "speak one's mind" dates back to the 16th century and refers to the act of expressing one's thoughts and opinions openly and honestly, even if they are controversial or unpopular. It is often used to convey a sense of courage and conviction, suggesting that the speaker is not afraid to say what they believe, even if it means causing offense or upsetting others.

I'm not afraid to speak my mind, even if it means ruffling some feathers.
The politician was known for his willingness to speak his mind, even when it meant going against the party line.
The outspoken activist was not afraid to speak her mind about the injustices she witnessed.
The child was always honest to a fault, never afraid to speak his mind, even to adults.
The therapist encouraged her patients to speak their minds, assuring them that their thoughts and feelings were valid and important.