A metaphorical reference to a person or animal sacrificed for the common good. The term is derived from the traditions of Abrahamic religion where a lamb is a highly valued possession.
In politics, a sacrificial lamb candidate is a candidate chosen to contest an election despite the fact that he or she has little chance of victory. The political party thus appoints the person as a sort of "sacrifice" to the stronger opponent.
In cinema and literature, the term sacrifical lamb refers to a supporting character whose sole dramatic purpose is to die, thus galvanizing the protagonist to action and simultaneously demonstrating how evil the villain is.
In husbandry, when escorting cattle accross a river suspected of having piranhas, farmers will sometimes sacrifice a sick or injured cow downstream before letting the herd enter the water.
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RandomAll definitions are 100% written by Wikipedia, not my own words.