What does "change of mind" mean?

A decision that rejects a previous decision in favor of something different.

Change of mind

Common synonyms include: about face, about-face, afterthought, afterthoughts, ambitendency, ambivalence.

noun

noun ·Uncommon ·Advanced level

Noun

1
A decision that rejects a previous decision in favor of something different.
"John had a sudden change of mind when he saw that better offer."
2
a decision to reverse an earlier decision wordnet

"John had a sudden change of mind when he saw that better offer."

From change one's mind.