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Synonyms
keel1 (kēl)

[Middle English kele, from Old Norse kjölr.]

noun 

  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 verbs

keel over
To collapse or fall into or as if into a faint.