brainstorm UK /ˈbɹeɪnstɔːm/US /ˈbɹeɪnstɔɹm/noun 3verb 3forms 3 noun3 •(US) A sudden thought, particularly one that solves a long-standing problem.I had been working on the problem for weeks, and then I had a brainstorm and saw that the solution was easy. •A session of brainstorming, investigating a problem to try to find solutions. •(UK) An unexpected mental error. verb3 •To investigate something, or solve a problem using brainstorming. •To participate in a brainstorming session. •To think up (ideas); especially, to do so creatively.I need you to brainstorm some suggestions for next week's activity schedule. formsbrainstormed · brainstorming · brainstorms