Make (an area of the seabed) into a polder by reclaiming it from the sea.
- Some were impoldered with embankments, pumps, and deep canals, but those proved hard to maintain.
- But, as the main waterways became silted up and were impoldered, the character of the city changed.
- A number of inland areas have been also been empoldered, some of them provided with pump drainage.
Late 19th century: from Dutch impolderen.
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