crossfade

Etymology
From.

Noun

 * 1)  A fade in which the volume of one audio track is lowered as that of another is raised.
 * 2)  A fade in which the picture of one video track is diminished as that of another is brightened.

Verb

 * 1)  To lower the volume of one audio track while raising that of another, so that they blend together.
 * 2)  To diminish the picture of one video track while raising that of another, so that they blend together.
 * 3)  To be under the influence of multiple psychoactive substances at the same time; most typically marijuana and alcohol.