Webster's Revised Unabridged Dictionary · 1913

Discolor

Discolor , transitive verb

[Old English descolouren, Old French descolorer, French décolorer, from Latin dis- + cololare, coloratum, to color, color color. See Color.]

1.
To alter the natural hue or color of; to change to a different color; to stain; to tinge; as, a drop of wine will discolor water; silver is discolored by sea water.
2.
To alter the true complexion or appearance of; to put a false hue upon.
To discolor all your ideas. — Watts