1 expressing motion or direction to a point on or within (walked into a tree; ran into the house).
2 expressing direction of attention or concern (will look into it).
3 expressing a change of state (turned into a dragon; separated into groups; forced into cooperation).
4 colloq. interested in; knowledgeable about (is really into art).
Etymology: OE into (as IN, TO)
Useful english dictionary. 2012.