Definitions:

1. A high tidal way in an estuary. NOUN
   • The eagre on the River Severn caught the onlookers by surprise, its powerful surge creating an awe-inspiring spectacle.
2. A high wave, often dangerous, caused by tidal flow. NOUN
   • Navigating the river during an eagre can be extremely dangerous due to the rapid and unpredictable water currents.

Synonyms:

• bore wave
• flood tide
• river bore
• surge wave
• tidal bore
• Tidal wave
• tide surge
• tide-rip