Brood (verb)

1. To sit on eggs to hatch them.
2. To care for and protect one's young.
3. To think deeply or sullenly about something, often with a sense of worry or resentment.

Origin:

From old english brōdan "to incubate, hatch", from proto-germanic *brōdijan.

Examples:

1. The hen brooded over her eggs until they hatched.
2. She brooded over the loss of her child.
3. The mother bear brooded over her cubs.
4. He was brooding about the argument he had with his partner.
5. Brood is a verb that can mean to sit on eggs to hatch them, care for and protect one's young or think deeply or sullenly about something, often with a sense of worry or resentment.