adjective
existing or occurring in large numbers or in a great quantity
adverb
in a state of being brooded or contemplated
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The hen sat abrood on her eggs, keeping them warm until they hatched.
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She always seems to be abrood about something, I wonder what's on her mind.
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I could tell he was abrood about failing the test, he looked so down.
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The idea of starting a new business had been abrood in his mind for months.