- 1[intransitive] brood (over/on/about something) to think a lot about something that makes you annoyed, anxious, or upset You're not still brooding over what he said, are you?
- 2[intransitive, transitive] brood (something) if a bird broods, or broods its eggs, it sits on the eggs in order to hatch them (= make the young come out of them)
NAmE//brud//Verb Forms present simple I / you / we / they brood
he / she / it broods
past simple brooded
-ing form brooding