波消しブロック
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Meanings
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wave-dissipating concrete block; tetrapod
A concrete block placed along coastlines to absorb wave energy and prevent erosion. Often called a tetrapod, though that is a specific brand name.
See also: 消波ブロック
Wave-dissipating blocks are lined up along the shore.
Wave-dissipating blocks are also called 消波ブロック.