Welcome to English in a Minute. A stone has a very hard surface. To set something into one would not be easy. So what do you think set in stone means?
Dan, what are you doing this weekend? I'm like a hucking with a friend, but I'm not totally sure yet. Well, if those plans aren't set in stone, my friend Kristen wants you to come with us to the Funky Boys concert.
You mean beautiful, funny, smart Kristen? Yeah, I'm free. I thought so. If your plans or decisions are set in stone, it is difficult or even impossible to make