Final answer:
The term for when group members conform in decision-making is groupthink, which can lead to extreme decisions and suppress opposing views.
Step-by-step explanation:
The term that refers to the phenomenon where group members feel pressured to conform in decision-making is called groupthink. Groupthink is characterized by the modification of individual opinions to what is believed to be the group consensus, often resulting in extreme and potentially faulty decisions. This phenomenon can deter members from sharing dissenting opinions and prioritize group cohesion over critical thinking. To avoid groupthink, strategies such as seeking outside opinions, private voting, and the leader holding back their views initially are beneficial.