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Noun: aegir
Usage: non-standard
  1. A high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
    "Surfers gathered to ride the famous aegir on the River Severn";
    - tidal bore, bore, eagre [UK, dialect], eager [UK, dialect]

Type of: tidal current, tidal flow

Encyclopedia: Aegir