bone · noun C or U /boʊn/Full view
B1 one of the hard pieces that make the structure inside a human or animal
Dictionary examples:

The X-ray showed a broken bone in his left hand.

There's still a lot of meat left on the bone - should I slice some off for you?

Learner example:

I saw things like dinosaur bones, mummies, etc. (Preliminary English Test; B1; Korean)

a bone of contention
C2 something that people argue about
Dictionary example:

Housework is a major bone of contention in our house.

Learner example:

Prices have always been the bone of contention among the managers. (Certificate of Proficiency in English; C2; Greek)

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