The phrase "Mark of Cain" comes from the biblical story of Cain and Abel. It refers to a symbolic mark that God placed on Cain as a punishment for killing his brother. Over time, the phrase has come to represent a stigma or curse. Synonyms for the "Mark of Cain" include a blemish, a stain, a scar, a curse, a brand, a malediction, a blight, a taint, a stigma. Each of these terms refers to some sort of mark or label that identifies a person as being marked by a negative experience or consequence. The "Mark of Cain" is therefore a powerful metaphor for the impact of past actions on one's present identity.