The term 'GROUPTHINK' is a 10-letter crossword solution for the term 'WHAT SHEEP PARTICIPATE IN'. Groupthink is a psychological phenomenon that occurs when a group of people make decisions without critically thinking about them. It is often seen in groups that are highly cohesive and have a strong sense of loyalty to each other. Groupthink can lead to poor decision making and can be detrimental to the group's overall success.