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keel over

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keel

1  [keel]
Use keel over in a Sentence
–noun
1. Nautical. a central fore-and-aft structural member in the bottom of a hull, extending from the stem to the sternpost and having the floors or frames attached to it, usually at right angles: sometimes projecting from the bottom of the hull to provide stability.
2. Literary. a ship or boat.
3. a part corresponding to a ship's keel in some other structure, as in a dirigible balloon.
4. (initial capital letter) Astronomy. the constellation Carina.
5. Botany, Zoology. a longitudinal ridge, as on a leaf or bone; a carina.
6. Also called brace molding. Architecture. a projecting molding the profile of which consists of two ogees symmetrically disposed about an arris or fillet.
–verb (used with object), verb (used without object)
7. to turn or upset so as to bring the wrong side or part uppermost.
—Verb phrase
8. keel over,
a. to capsize or overturn.
b. to fall as in a faint: Several cadets keeled over from the heat during the parade.
—Idiom
9. on an even keel, in a state of balance; steady; steadily: The affairs of state are seldom on an even keel for long.
Origin:
1325–75; 1895–1900 for def. 8; ME kele < ON kjǫlr; c. OE cēol keel, ship; see keel 2

Related forms:
keeled, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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keel 1   (kēl)   
n.  

  1. Nautical

    1. The principal structural member of a ship, running lengthwise along the center line from bow to stern, to which the frames are attached.

    2. A ship.

  2. A structure, such as the breastbone of a bird, that resembles a ship's keel in function or shape.

  3. The principal structural member of an aircraft, resembling a ship's keel in shape and function.

  4. A pair of united petals in certain flowers, as those of the pea.

intr. & tr.v.   keeled, keel·ing, keels Nautical
To capsize or cause to capsize.
Phrasal Verb(s):
keel overTo collapse or fall into or as if into a faint.

[Middle English kele, from Old Norse kjölr.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: keel
Pronunciation: 'kEl
Function: noun
: acute septicemic salmonellosis or paratyphoid of ducklings marked by sudden collapse and death ofapparently healthy birds called also keel disease
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Idioms & Phrases

keel over

Collapse, as if in a faint; also, faint. For example, When she heard the awful news, she keeled over. This term alludes to a vessel rolling on its keel and capsizing. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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