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    built-up

    0  Views: 623 Answers: 2 Posted: 11 years ago

    2 Answers

    built-up 
    adj.
    1. Made by fastening several layers or sections one on top of the other: a built-up roof.
    2. Filled with buildings; developed: a built-up neighborhood.


    http://www.thefreedictionary.com/built-up

    What has built up? 



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