To be fair, it's not a must win. That term is a bit overused.
A one and done playoff game is a must win.
If one more loss mathematically eliminates you, that's a must win.
If we lose to Rutgers but then beat Purdue, Illinois and Wisconsin (granted very unlikely) then we are in great shape.
Yes, I am being pedantic here. I know. It just seems every game from game 1, somebody is calling a must win.