Anything causing trouble, discord, or jealousy.
According to Greek mythology, the goddess Eris tossed the Golden Apple of Discord in the midst of the feast of gods at the wedding of Peleus and Thetis as a prize of beauty, thus sparking a vanity-fueled dispute among Hera, Athena, and Aphrodite that eventually lead to the Trojan War.
The "apple of discord" is used to signify the core, kernel, or crux of an argument, or a small matter that could lead to a bigger dispute.
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Idioms, Fallacies, and Paradoxes
RandomAll definitions are 100% written by Wikipedia, not my own words.
