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hit upon

B2 formal inseparable transitive
In simple words

To suddenly think of or find a good idea, sometimes by accident.

Literal meaning: To strike something on top of it — the leap to 'discover' is idiomatic.

Meanings

1 B2 idiomatic formal

To discover or think of a good idea, plan, or solution, often by chance or sudden inspiration.

"Newton is said to have hit upon his theory of gravity after observing a falling apple."

"He hit upon the idea of using a rubber band to hold the papers together."

— The Economist (paraphrased journalistic usage, widely attested pattern)
Grammar: inseparable
2 C1 idiomatic formal

To find or encounter something unexpectedly while searching or exploring.

"While sorting through the archive, the historian hit upon a collection of previously unknown letters."

Grammar: inseparable
Usage notes

'Hit upon' is the more formal and literary variant of 'hit on' in the sense of discovering an idea. It is common in academic, journalistic, and historical writing. Not used for flirting.

Commonly used with

idea solution formula method answer plan

Forms

Base
hit upon
I/you/we/they
3rd person
hits upon
he/she/it
Past simple
hit upon
yesterday
Past participle
hit upon
have + pp
-ing form
hitting upon
continuous

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