Noun
second unit (plural second units)
(cinematography) A separate team that shoots footage that is of secondary importance for the final cut of the motion picture, as opposed to first unit.
Last summer a second unit production crew went to France and shot scenes for several of this season's episodes. They shot costumed actors in and around real castles and landmarks, we couldn't possibly have duplicated here in Hollywood. Vic Morrow
I think there are movies that are so gigantic that you need a second unit. Guillermo del Toro
I think my biggest break though came probably on Patriot Games because it was the biggest, longest second unit up to that point. It was like five months of shooting and a huge crew. David R. Ellis
On Darjeeling, I was on set every day and I acted as the second unit director and a producer on that film. I was there throughout the whole process. On Moonrise Kingdom, I showed up for one day. Roman Coppola