To reverse, go backwards.
To remove from or allow distance.
To delay or obstruct.
To install or position behind a boundary or surface, or in a recess.
To cost money.
To replace with something better.
To improve, usually applied to technology, generally by complete replacement of one or more components
To improve the equipment or furnishings of or services rendered to
To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name.
To improve in condition or status.
An upward grade or slope.
An improvement
An improved component or replacement item, usually applied to technology
Up a slope or grade.