overdraw

verb

1. To withdraw more money from an account than there is credit; to make an overdraft
2. To use a device for shooting arrows shorter than the draw of the bow.
3. (dated)To exaggerate.
4. To draw over the top of existing content.
5. To draw the air in through a harmonica while adjusting the mouth so that the note goes up a half tone.

noun

1. (countable, uncountable)The process by which, during the rendering of a three-dimensional scene, a pixel is replaced by one that is closer to the viewpoint, as determined by their Z coordinates.