The Oxford Thesaurus An A-Z Dictionary of Synonyms - happenv.

1) occur, take place, come about, go on, come to pass, develop; betide, chance, prove, materialize, Colloq transpire, come off, Slang cook: What is happening? As it happens, everyone has already left. 2) befall, become of: What will happen to me if I refuse? 3 happen on or upon. come upon, chance or hit on or upon, stumble on or upon, find, turn up, encounter, meet with: It was then that I happened on an old letter of his.