brainstorm
US /ˈbreɪn.stɔːrm/
UK /ˈbreɪn.stɔːrm/
1.
(of a group of people) to suggest a lot of ideas for a future activity very quickly, before considering some of them more carefully:
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The team got together to brainstorm.
1.
a sudden smart idea:
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The toy's inventor was watching his children play one day when he had a brainstorm.