No, thank you. I do not want a serving of that ice cream sundae. I am trying to get back in shape and as such am abstaining from dessert. I will give it up, forgo it, do without.
I could easily come up with a pithy comeback to what you just said, but I don’t want my words to ever be hurtful so I’d rather refrain, desist. Keep myself in check, renounce, sit this one out.
My dog is barking furiously at a passing stranger. To avoid a confrontation I’m going to restrain him, control him, confine him, hem him in.