1. to enter, to go into, to trespass (on)

Godan verb with 'ru' ending intransitive verb

2. to meddle (in), to interfere (in), to pry (into)

Godan verb with 'ru' ending intransitive verb

3. to go deeply (into an issue), to delve deeper (into)

Godan verb with 'ru' ending intransitive verb