simple past tense and past participle of happen

Something that happens. / A spontaneous or improvised event, especially one that involves audience participation.

(slang, of a place) Busy, lively; vibrant, dynamic; fashionable. / (slang, of a person or product) Trendy, up-to-the-minute.

present participle of happen

plural of happening

(intransitive) To occur or take place. / (transitive, archaic) To happen to; to befall. / (intransitive or impersonal, with infinitive) To do or occur by chance or unexpectedly.

(obsolete or dialect) maybe, perhaps.

Third-person singular simple present indicative form of happen

Worrying is not necessary, since it is common to make this mistake or for this to occur.

(idiomatic) By coincidence, incidentally