All together:
— The students turned out en masse.

synonyms: as a group, en bloc.

Roget 50: wholly, altogether; totally etc. (completely) 52; entirely, all, all in all, as a whole, wholesale, in a body, collectively, all put together; in the aggregate, in the lump, in the mass, in the gross, in the main, in the long run; en masse, as a body, on the whole, bodily^†, en bloc, in extenso [Lat.], throughout, every inch; substantially.    ... show more

Roget 712: hand in hand, side by side, shoulder to shoulder, en masse, in the same boat.