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座り込む， 坐り込む， すわりこむ
1. to (enter and) sit down, to plop oneself down, to plant oneself down
2. to sit down (and refuse to move), to sit in (in protest)
坐下，坐下来；扑通一声坐下
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