Phrase guide
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noun
An impoundment dam that is wider at the base than at the top, and which uses the massive weight of the dam's mass to withstand the force of water being stored behind the dam in its reservoir.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From gravity + dam. From using the weight of the dam to withstand the force of water being impounded.
