Looking on the internet deeply has found these results:

Elaborate on is the most popular phrase on the web.

elaborate in 1498,000 results on the web	Elaborate on 110,800,000 results on the web More popular!
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It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	We have sought to elaborate on the crisis that has brought us physical and moral suffering. Take a few minutes to brainstorm on how you might elaborate on the following answers. Maria Chatzichristodoulou: Can you elaborate on that. In this article I wish to elaborate on Version History and its ability to make or break your document manager. Other injuries which I don't wish to elaborate on at this time. Can the Commission elaborate on this? It would serve no purpose here to elaborate on that aspect. I think deputy commissioner Daniels is in a position to elaborate on that.

elaborate in

1498,000 results on the web

Elaborate on

110,800,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

We have sought to elaborate on the crisis that has brought us physical and moral suffering.
Take a few minutes to brainstorm on how you might elaborate on the following answers.
Maria Chatzichristodoulou: Can you elaborate on that.
In this article I wish to elaborate on Version History and its ability to make or break your document manager.
Other injuries which I don't wish to elaborate on at this time.
Can the Commission elaborate on this?
It would serve no purpose here to elaborate on that aspect.
I think deputy commissioner Daniels is in a position to elaborate on that.