1. a wall or embankment built along a shore to prevent erosion and protect against flooding from the sea

Examples

• The city built a massive seawall to protect the waterfront district from storm surges.
• Hurricane waves crashed over the old seawall, flooding the coastal road.
• Engineers reinforced the concrete seawall after years of saltwater damage.
• The historic seawall has protected the harbor for over a century.
• Rising sea levels threaten to overwhelm the existing seawall.
• Construction crews are building a new seawall along the vulnerable coastline.