Bore, n. [Icel. bāra wave: cf. G. empor upwards, OHG. bor height, burren to lift, perh. allied to AS. beran, E. 1st bear. √92.] (Physical Geog.) (a) A tidal flood which regularly or occasionally rushes into certain rivers of peculiar configuration or location, in one or more waves which present a very abrupt front of considerable height, dangerous to shipping, as at the mouth of the Amazon, in South America, the Hoogly and Indus, in India, and the Tsien-tang, in China. (b) Less properly, a very high and rapid tidal flow, when not so abrupt, such as occurs at the Bay of Fundy and in the British Channel.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.