Final answer:
The tendency to avoid expressing opposing opinions within a cohesive team due to a desire for consensus is known as groupthink.
Step-by-step explanation:
The tendency for people to be so committed to a cohesive team that they are reluctant to express contrary opinions refers to groupthink. Groupthink is a phenomenon where members of a group prioritize cohesion and consensus over critical thinking, even when that consensus might lead to poor decision-making. It often involves the quashing of dissenting opinions, the shielding of group leaders from opposing views, and the perception of unanimity that may not actually exist. To prevent groupthink, strategies such as seeking outside opinions, private voting, and developing a contingency plan can be employed.