undraw

verb2

1. •
   To draw aside or open; to pull back a layer of fabric, e.g. a curtain.

   • She undrew the curtain to reveal the shining rays of the sun.
2. •
   To clear or erase part of a drawing.

   • It is easy to highlight graphics on a monochrome system. The simplest way is to set the GC to the GXxor logical function and draw your graphics once to draw them and again to undraw them. — 1992