"keel" in the noun sense
a projection or ridge that suggests a keel
the median ridge on the breastbone of birds that fly
one of the main longitudinal beams (or plates) of the hull of a vessel can extend vertically into the water to provide lateral stability
"keel" in the verb sense
1. stagger, reel, keel, lurch, swag, careen
walk as if unable to control one's movements
"The drunken man staggered into the room"
Source: WordNet® (An amazing lexical database of English)
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