Definitions from Wiktionary (brain storm)

▸ noun:  (medicine, neurology) A seizure, convulsion, or similar incident of abnormal brain activity.
▸ noun:  Alternative form of brainstorm (“a sudden thought which solves a problem; a brainstorming session”) [(US) A sudden thought, particularly one that solves a long-standing problem.]
▸ verb:  Alternative form of brainstorm (“solve a problem with brainstorming”) [(intransitive) To investigate something, or solve a problem using brainstorming.]

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