To mention or discuss a topic briefly and without going into detail, typically in a formal or written context.
To mention something briefly, especially when speaking or writing formally.
2 meanings, ordered from most common to least. Color-coded by CEFR level.
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.
To relate to or concern a particular subject.
"The documentary touches upon issues that affect millions of people worldwide."
To gently touch the surface of something.
To mention something briefly, especially when speaking or writing formally.
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.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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