She spoke in a tone of voice that she usually 'reserved' for her students. [=that she usually only used for her students]
I will 'reserve judgment' [=will not make a judgment/decision] until I know the full story.
We 'reserve' the right to make further changes to the agreement if necessary.
(..) was Willie Santiago poisoned? Yes. Thank you, sir. I have no more questions. Commander, you may step down. Please the court, while we reserve the right to call rebuttal witnesses... the government rests. We'll stand in recess until , Monday the th... at which time, the defense (..)1992 A Few Good Men