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happen upon

B1 neutral inseparable transitive
In simple words

To accidentally find something you were not expecting or looking for.

Literal meaning: To move upon something and have it occur as a matter of chance.

Meanings

1 B1 idiomatic neutral

To find or encounter something or someone by accident, without looking for it.

"While hiking in the hills, we happened upon the ruins of an ancient church."

"I happened upon a copy of Orwell's 'Down and Out in Paris and London' in a second-hand bookshop."

— Commonly cited type of anecdote in literary memoir writing; representative of established idiomatic usage
Grammar: inseparable
2 B2 idiomatic neutral

To come across an idea or solution by chance rather than through deliberate effort.

"The scientist happened upon the discovery quite by accident while working on a different experiment."

Grammar: inseparable
Usage notes

'Happen upon' is the more common and slightly more formal variant compared to 'happen on'. Frequently found in literary and journalistic writing. Used in both British and American English.

Commonly used with

treasure evidence scene stranger solution photograph

Forms

Base
happen upon
I/you/we/they
3rd person
happens upon
he/she/it
Past simple
happened upon
yesterday
Past participle
happened upon
have + pp
-ing form
happening upon
continuous

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