brain storm

Short definition from Wiktionary

Noun

1. 1
   A seizure, convulsion, or similar incident of abnormal brain activity.
2. 2
   Alternative form of brainstorm (“a sudden thought which solves a problem; a brainstorming session”).
3. 3
   Alternative form of brainstorm.
4. 4
   Alternative form of brain storm.

Verb

1. 1
   Alternative form of brainstorm (“solve a problem with brainstorming”).
2. 2
   Alternative form of brainstorm.