The term 'HAPPENED UPON' can be summarized by two crossword solutions: MET and FOUND. The phrase 'happened upon' means to come across something or someone unexpectedly. It is often used to describe an unexpected meeting or discovery. For example, one might say that they 'happened upon' a new restaurant while walking down the street. In this case, the two crossword solutions MET and FOUND are both applicable. MET implies that the person encountered someone or something, while FOUND implies that the person discovered something.