What does bone of contention mean?

bone of contention meaning in General Dictionary

the subject of a dispute

Sentence Examples with the word bone of contention

Silesia, now split up into seventeen principalities, was the bone of contention between them; and when Casimir suddenly invaded that country, took Wschowa, and made Prince Charles of Bohemia a prisoner, war between the two kingdoms actually broke out and Casimir was besieged in Cracow by the Czechs.

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