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.
(..) down in Texas. Thanks. Okay, when Dostoyevsky tells us that he detests the fact... that two and two make four... and that he reserves his sacred right... to insist that two and two make five, he's saying what? - That his life is based on... - Insanity. (..)1974 The Gambler