#1 sin n. [sinfulness, wickedness] estrangement from god. wn
#2 sin n. [sinning] an act that is regarded by theologians as a transgression of God's will. wn
#3 sin v. [transgress, trespass] commit a sin; violate a law of God or a moral law. wn
#4 sin v. [drop the ball, blunder, boob, goof] commit a faux pas or a fault or make a serious mistake; "I blundered during the job interview". wn
#5 sin n. [sine] ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle. wn
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