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立ち入る， 立入る， たちいる
1. to enter, to go into, to trespass (on)
2. to meddle (in), to interfere (in), to pry (into)
3. to go deeply (into an issue), to delve deeper (into)
tbd
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