Definition of touch on/upon phrasal verb from the Oxford Advanced American Dictionary

 

touch on/upon

 phrasal verb
phrasal verb
 
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Phrasal Verbs

touch on/upon something

 
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to mention or deal with a subject in only a few words, without going into detail In his speech he was only able to touch on a few aspects of the problem. The central issue of the debate was hardly touched on in his speech.