in (one's) right mind(redirected from in their right mind)
in (one's) right mind
Thinking soundly; rational. Usually used to set up a context in which any sane person would or could do, say, or think a certain thing. No one in their right mind agrees to those kind of terms—unless they sign a contract without reading it. You must not be in your right mind if you think that breaking up their wedding is a good idea.
in one's right mind
Fig. sane; rational and sensible. (Often in the negative.) That was a stupid thing to do. You're not in your right mind. You can't be in your right mind! That sounds crazy!