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touch upon

B2 formal inseparable transitive
In simple words

To mention something briefly, especially when speaking or writing formally.

Literal meaning: To gently touch the surface of something.

Meanings

1 B2 idiomatic formal

To mention or treat a topic briefly without going into detail, typically in formal discourse.

"In her lecture, the professor touched upon the economic factors without analysing them in depth."

"I shall touch upon the general principles that have guided our policy."

Grammar: inseparable
2 B2 idiomatic formal

To relate to or concern a particular subject.

"The documentary touches upon issues that affect millions of people worldwide."

Grammar: inseparable
Usage notes

More formal than 'touch on' and often found in academic writing, formal speeches, and literary texts. The choice between 'touch on' and 'touch upon' is largely stylistic; 'upon' lends a more elevated register. Both are correct and interchangeable in most contexts.

Commonly used with

subject issue theme question matter point

Forms

Base
touch upon
I/you/we/they
3rd person
touches upon
he/she/it
Past simple
touched upon
yesterday
Past participle
touched upon
have + pp
-ing form
touching upon
continuous

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Synonyms

touch on mention briefly allude to refer to address briefly skim over

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