godan verb (-mu), intransitive verb
be absorbed in; be deeply into; fall for
Describes losing oneself in an activity, interest, or person. Often implies going beyond a healthy limit. Used for hobbies, work, or romantic infatuation.
彼は新しいゲームにのめり込んでいる。
He is completely absorbed in the new game.
彼女にのめり込
I've fallen for her so hard that I can't focus on work.