expatiate
intransitive-verb
UK: /ɪkˈspeɪʃieɪt/
US: /ɪkˈspeɪʃieɪt/
To speak or write at length or in detail about a topic.
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She likes to expatiate on her travels.
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The professor began to expatiate upon the intricacies of quantum physics for an hour.
To elaborate or expand upon a subject in speech or writing; to add details.
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He will expatiate about cooking.
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During the presentation, the speaker chose to expatiate further on the environmental impact.