brain ‧ storm ‧ ing /ˈbreɪnstɔːmɪŋ $ -ɔːr-/ BrE AmE noun [uncountable]
when a group of people meet in order to try to develop ideas and think of ways of solving problems:
a brainstorming session to come up with slogans for new products
—brainstorm verb [intransitive and transitive] :
Employees get together and brainstorm ideas.