Open English Wordnet
Verbs
(v)happen, hap, go on, pass off, occur, pass, fall out, come about, take placecome to pass“What is happening?”,
“The meeting took place without an incident”,
“Nothing occurred that seemed important” (v)happen, befall, bechancehappen, occur, or be the case in the course of events or by chance“It happens that today is my birthday”,
“These things befell” (Santayana) (v)happenchance to be or do something, without intention or causation“I happen to have just what you need!” (v)find, happen, chance, bump, encountercome upon, as if by accident; meet with“We find this idea in Plato”,
“I happened upon the most wonderful bakery not very far from here”,
“She chanced upon an interesting book in the bookstore the other day”