1 young, offspring, progeny; children, family:
A mallard was tending her brood among the rushes.
2 incubate, hatch, set, sit, cover:
The old hen was brooding three eggs.
3 Also, brood on or over. ponder (on or over), meditate (on or over), contemplate, ruminate (on or over), muse (on or over):
He just sits there brooding over the subject of his next novel.
4 mope, sulk, pout, pine, eat one's heart out, fret, worry, agonize, despair:
Don't just brood over the problem, do something about solving it!