1. unexpected strokes of luck or fortunate accidents
Usage: informal
2. the flat triangular parts at the end of an anchor that dig into the sea bottom
Usage: nautical
3. the broad flat tail fins of whales, dolphins, or other marine mammals
Usage: marine biology

Examples

• His success was just a series of lucky flukes.
• The anchor’s flukes caught firmly in the sandy bottom.
• The whale’s powerful flukes propelled it through the water.
• The veterinarian found liver flukes in the sheep.
• Winning the lottery twice was an incredible fluke.
• The ship’s anchor had two sharp flukes for better grip.
• Humpback whales use their flukes for swimming and communication.