(1):

(v. t.) To pollute by mixture or association; to spoil or corrupt; to blot; to stain.

(2):

(v. i.) To mingle; to mix; to unite intimately; to pass or shade insensibly into each other, as colors.

(3):

(n.) A thorough mixture of one thing with another, as color, tint, etc., into another, so that it cannot be known where one ends or the other begins.

(4):

(a.) To make blind, literally or figuratively; to dazzle; to deceive.

(5):

(v. t.) To mix or mingle together; esp. to mingle, combine, or associate so that the separate things mixed, or the line of demarcation, can not be distinguished. Hence: To confuse; to confound.