1. plural of helldiver; a small diving bird of the grebe family, known for its ability to dive deep underwater and its evasive behavior when pursued.
Usage: chiefly North American; also called pied-billed grebe
2. plural of helldiver; people who engage in dangerous or reckless diving activities.
Usage: informal; rare

Examples

• The helldivers disappeared beneath the surface of the lake in seconds.
• Birdwatchers spotted a group of helldivers on the pond early in the morning.
• These small water birds earned the name helldivers because of their remarkable diving skills.
• The helldivers were difficult to observe because they spent most of their time underwater.
• During migration season, helldivers can be found on lakes throughout North America.