Definition of "bone of contention" [bone of contention]

• Something that continues to be disputed; something on which no agreement can be reached (noun)

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• "The question of a motorbike was a bone of contention between them and he hoped that Ben would have enough sense to draw his own conclusions."
• "HIV/AIDS : Former South African President Thabo Mbeki's policy, which questioned the conventional treatment of the disease, was a bone of contention for many American policy makers."
• "Neither Christopher nor Aspin objected to the notion of Lake chairing the main policymaking committee, even though the prerogative of the national security adviser had been a major bone of contention during the Carter administrationand many others."