I'm looking for a phrase or an idiom meaning "to get heavily involved in something" or "to become passionate about something" where "something" could be a hobby, lifestyle, a music genre etc.
One possibility would be simply "to get into something" but this doesn't seem to convey being passionate about the thing in question. Another one is "to get sucked into something" but a Google search indicates that this tends to mean "to get involved in something against one's will" which is not what I am after.
Best Answer
A common phrase with positive overtones is immerse oneself.
A more colloquial phrase, aslo usually positive, is dive in.
Also plunge in.