Ea·gre n. A wave, or two or three successive waves, of great height and violence, at flood tide moving up an estuary or river; -- commonly called the bore or tidal bore. See Bore.
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tidal bore
n : a high wave (often dangerous) caused by tidal flow (as by
colliding tidal currents or in a narrow estuary) [syn: bore,
eagre, aegir, eager]