overcolour noun 1verb 1forms 4 noun1 •Colour that is superimposed on another previously applied to obtain a different gradation, or a particular transparency effect. verb1 •(figurative) To exaggerate.He was seized after a minute, face to face with his actual comrade, with the impulse to overcolour. — 1903 formsovercoloured · overcolored · overcolouring · overcolours