1. to fall (over, down), to collapse, to take a fall, to topple
2. to be destroyed (in a collapse), to collapse, to cave in, to crumble, to give away
3. to be confined to bed (with an illness), to come down with, to break down (e.g. from overwork)
4....
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although