Meaning of the word "bone of contention" in English

What does "bone of contention" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

bone of contention

US /boʊn əv kənˈtɛnʃən/
UK /bəʊn əv kənˈtɛnʃən/

Idiom

a subject or issue over which there is continuing disagreement

Example:
The division of assets became the main bone of contention between the siblings.
Their differing views on politics have always been a bone of contention.