Moving a site to an existing domain with content

[johnny12]

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I have two similar sites, both have content on them and are listed in search engines and both domains consist of the same keywords but one is singular and the other is plural. I would like to merge both sites, moving the content from the plural domain to the singular as the singular term gets 3 times as many searches. What is the best way of doing this without Google thinking one site has copied content from the other? I don;t want to keep both sites running as I can't be bothered writing two different copies on the same subject.

Another question. The plural domain is ranked higher than the singular; would moving the content from the plural domain to the singular domain improve its ranking?

Thanks.

[Barry]

Its a predicament that a few of us have had I guess.

If I had to make a choice I would re-direct the domain that was not ranking to the one that was rather than the other way around.

Ta

Baz