The term COME UPON can be defined by the following crossword solutions: MEET (4 letters), FIND (4 letters), HIT (3 letters), RUNINTO (7 letters), OVERTAKE (8 letters), and RESEARCH (8 letters). To MEET someone is to come into contact with them, either by chance or through an intentional effort. To FIND something is to discover it, often through searching or investigation. To HIT something is to make physical contact with it, usually with some force. To run into something is to encounter it unexpectedly. To OVERTAKE something is to pass it, usually while in motion. To RESEARCH something is to study it in depth, often to gain knowledge or understanding.