(dated, 1960s-1970s) One who participates in a happening. / A person who makes things happen. / A person to whom things happen.

to find by chance

Capable of happening.

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

Expresses acceptance of whatever happens in the future.

(vulgar) An expression of acceptance of misfortune and unforeseen bad circumstances or luck.

(informal) An informal greeting.

(intransitive, idiomatic) To arrive by chance; to occur by happenstance.

simple past tense and past participle of happen upon

present participle of happen upon