To understand or grasp fully and thoroughly.
To interrogate in order to arrive at a deeper understanding.
To become involved or interested in (a discussion, issue, or activity).
To enter (an unfavourable state).
To move into (an object), such that one ends up inside it.
To put on (an item of clothing).
To cause to behave uncharacteristically; to possess.
To reach into or interact with (an object).