You know I am looking for a verb that roughly means "keep something warm with one's body". It's not a general-use word, because it mostly applies to certain animals. Let me give you an example:
The hen ___ the eggs to keep them warm.
I don't think it's a verb you can use for human beings, and I don't think there's a verb that applies for human beings, but I would be curious to know if there's a general-use word.