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Discover Ludwig"he expanded on" is correct and commonly used in written English.
You can use it to indicate that someone gave more extensive information or detail about something they had previously said or discussed. For example: He gave us an overview of the project, and then he expanded on the timeline for completion.
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The hedge fund manager says the central bank's loose-money policy is hindering economic growth, an argument he expanded on during a conference in New York on Thursday.
REUTERS David Einhorn Continues His Take Down of Fed Policy | The hedge fund manager says the central bank's loose-money policy is hindering economic growth, an argument he expanded on during a conference in New York on Thursday.
Tortorella named no one, even as he expanded on his answer.
Galambos makes frequent visits to Beijing, and on one occasion when I met him he expanded on this theme.
Late one morning, in a rehearsal studio near Times Square, he expanded on the elements of virtuosity.
He expanded on the theme.
Later, he expanded on the point.
Later, in conversation with me, he expanded on those comments.
He expanded on his reasons for creating the board.
He expanded on that in a speech in Des Moines.
He expanded on this in a Koch Industries newsletter.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com