Remaining. To finish. (In a group of events or items) belonging to the subgroup that have not passed or have not been finished or have not been addressed yet
Right now, out of four bicycles, that's two down and two to go.
Served in a package or takeout container so as to be taken away from a restaurant rather than eaten on the premises
I'd like two burgers, two small orders of fries and two shakes, to go.