To weaken or work against; to hinder, sabotage.
To erode the base or foundation of something, e.g. by the action of water.
To dig underneath (something), to make a passage for destructive or military purposes; to sap.
To improve, usually applied to technology, generally by complete replacement of one or more components
To replace with something better.
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.