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土砂降り， どしゃ降り， どしゃぶり
1. downpour, pouring rain, heavy rain, pelting rain, cloudburst
倾盆大雨、暴雨、大雨、倾泻的雨、雷阵雨
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