Hi,
I checked my website about one week ago with Google Webmaster Tool and in the Content Analysis, GG said I had 50 duplicate title tags and 37 meta description tags and they showed the No of pages that were duplicated. 
What they mean by that?  I checked the tags again, they were similar in description but for each description I put different keywords/ key phrases in. 
For the tilte tags, I have changed one key phrase/keyword at the beginning of the title and keep the rest the same:
eg.   Dress | Women Clothing | Long Gown        to            Women Dress | Women Clothing | Long Gown     

For the meta description tags
The MDTags were:
Beautiful women clothing at affordable prices
and in another meta description tag :
Beautiful women dresses at affordable prices.   

I have changed the description of every tags but still put the same keywords/key phrases (My website is on the first page of GG and Yahoo.com.au for those keywords, I am afraid if I change the tags completely including the key words, my web ranking will drop)

Please explain and give me some advice on if I have done the changes correctly or what else I should do.  Thanks heaps in advance!
Stella99

I would have thought it was because the tags themselves were duplicated on the page, but from looking at your site it does not appear to be the case.

Can you give a specific page example?

The titles and keywords need to be applicable to each individual page...not your website in general.

The  Google Webmaster Tool is just a guide...I have found it incredibly helpful on several occasions and made the changes they suggested. You still need to use your common sense with it though.

ER

Pages with duplicate meta description:

10 pages with:
The Curvysea women's plus size swimwear collection brings you fashionable plus size swimwear guarant
‎/about-us.html‎‎/
article1.html‎‎/
article2.html‎‎/
contact-us.html‎‎/
customer-service.html‎‎/
faq.html‎‎/
links.html‎‎/
privacy.html‎‎/
sizing-chart.html‎‎/
testimonials.html‎

Yes these pages all have the same meta desc

<meta name="description" content="The Curvysea women's plus size swimwear collection brings you fashionable plus size swimwear guaranteed to flatter any body shape - gorgeous one or two piece swimsuits, tankinis, skirtinis and swimdresses." />

The duplicate title tags are evident on the product pages. In the one piece O see several products with the same title tag  words

Just go through every page and check them, if needed copy them out into a spreadsheet to see them all easily and so make adjustments to suit. They only have to differ slightly.