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Related to eagre: Egre
ea·grealso ea·ger (ē′gər, ā′gər)
n. Chiefly British
See tidal bore.
[Early Modern English eagre, egre, ultimately (via Middle English *egre) from Old English *ēagor, ēgor (stem *ēaggr-), flood, water (attested in the poetic kennings ēgorhere, "water-host," deluge, and ēgorstrēam, "flood-stream," ocean); perhaps akin to Old English ēa, running water, stream, river, and īeg, island; see island.]
(Physical Geography) a tidal bore, esp of the Humber or Severn estuary
[C17: perhaps from Old English ēagor flood; compare Old English ēa river, water]
ea•gre(ˈi gər, ˈeɪ gər)
a tidal bore.
[1640–50; origin uncertain]