Definitions of brood:

• noun:   the young of an animal cared for at one time
• verb:   hang over, as of something threatening, dark, or menacing

  Example: "The terrible vision brooded over her all day long"

• verb:   sit on (eggs)

  Example: "Birds brood"

• verb:   think moodily or anxiously about something
• verb:   be in a huff; be silent or sullen
• verb:   be in a huff and display one's displeasure
• name:  A surname (very rare: popularity rank in the U.S.: #52664)