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倒れる， たおれる
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....
倒，倒下；死，被杀；倒台
に
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
tbd