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.
(..) what he needs from you is an import license. And why would we want to weaponize this material? As a deterrent. A silver bullet to keep in reserve to use against the Kryptonians. So, the day doesn't come, Madame. when your children are waving daisies at a reviewing stand. Last I looked, (..)2016 Batman v Superman: Dawn of Justice