Toward the end of The Guardians of the Galaxy
when the Dark Aster is about to crash, Groot begins enfolding the rest of the team in a protective, multi-layered cocoon of branches and vines, presumably to cushion them against the impact. When Rocket tearfully asks why he's sacrificing himself for the rest of the team, Groot slowly says, "We are Groot."
Since this is very distinct and different from the rest of his dialogue, no one needs to translate it as Rocket did a few times with his other lines.
But the exact meaning of the line is a bit unclear. Has anyone involved in the production of the movie said anything about what that line means and why he said it that way?