As one unit (2,4)
I believe the answer is:
en bloc
'as one unit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for en bloc that I've seen before include "Wholesale, as one unit" , "All together, en masse" , "As a group (Fr.)" , "All together (French)" , "As a whole (body)" .)