tidal bore

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3 [bawr, bohr]
an abrupt rise of tidal water moving rapidly inland from the mouth of an estuary.
Also called tidal bore.

1275–1325; Middle English bare < Old Norse bāra wave

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bore1 (bɔː)
1.  to produce (a hole) in (a material) by use of a drill, auger, or other cutting tool
2.  to increase the diameter of (a hole), as by an internal turning operation on a lathe or similar machine
3.  (tr) to produce (a hole in the ground, tunnel, mine shaft, etc) by digging, drilling, cutting, etc
4.  informal (intr) (of a horse or athlete in a race) to push other competitors, esp in order to try to get them out of the way
5.  a hole or tunnel in the ground, esp one drilled in search of minerals, oil, etc
6.  a.  a circular hole in a material produced by drilling, turning, or drawing
 b.  the diameter of such a hole
7.  a.  the hollow part of a tube or cylinder, esp of a gun barrel
 b.  the diameter of such a hollow part; calibre
8.  (Austral) an artesian well
[Old English borian; related to Old Norse bora, Old High German borōn to bore, Latin forāre to pierce, Greek pharos ploughing, phárunxpharynx]

bore2 (bɔː)
1.  (tr) to tire or make weary by being dull, repetitious, or uninteresting
2.  a dull, repetitious, or uninteresting person, activity, or state
[C18: of unknown origin]

bore3 (bɔː)
a high steep-fronted wave moving up a narrow estuary, caused by the tide
[C17: from Old Norse bāra wave, billow]

bore4 (bɔː)
the past tense of bear

tidal bore
another term for bore

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. borian "to bore through, perforate," from bor "auger," from P.Gmc. *buron (cf. O.N. bora, Swed. borra, O.H.G. boron, M.Du. boren, Ger. bohren), from PIE base *bher- (2) "to cut with a sharp point" (cf. Gk. pharao "I plow," L. forare "to bore, pierce," O.C.S. barjo "to strike, fight," Albanian brime
"hole"). The meaning "diameter of a tube" is first recorded 1570s; hence figurative slang full bore (1936) "at maximum speed," from notion of unchoked carburetor on an engine. Sense of "be tiresome or dull" first attested 1768, a vogue word c.1780-81 according to Grose; possibly a figurative extension of "to move forward slowly and persistently," as a boring tool does.
"The secret of being a bore is to tell everything." [Voltaire, "Sept Discours en Vers sur l'Homme," 1738]

p.t. of bear (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
bore   (bôr)  Pronunciation Key 
  1. In fluid mechanics, a jump in the level of moving water, generally propagating in the opposite direction to the current. Strong ocean tides can cause bores to propagate up rivers.

    1. The white, shallow portion of a wave after it breaks. The bore carries ocean water onto the beach.

    2. A tidal wave caused by the surge of a flood tide upstream in a narrowing estuary or by colliding tidal currents.

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