The phrase "bred in the bone comes out in the marrow" is a metaphorical saying that means a person's inherent nature or character will always reveal itself, regardless of any attempts to hide it.

Here's a breakdown:

* Bred in the bone: This refers to something that is deeply ingrained in a person, like a characteristic or a trait they have inherited.

* Comes out in the marrow: This refers to something that is so fundamental to a person's being that it is essentially part of their very core.

The phrase suggests that even if someone tries to change their behavior or act differently, their true nature will inevitably come out in their actions and decisions. It's a way of saying that you can't hide who you truly are.

Here are some examples of how this phrase might be used:

* "He may try to act polite, but his rudeness is bred in the bone and it always comes out in the marrow."

* "Her kindness is bred in the bone and it comes out in the marrow in all her interactions with others."

This saying emphasizes the importance of understanding that our true nature is often revealed in our actions and interactions with the world, even when we try to suppress it.