keel

(noun) a projection or ridge that suggests a keel.

(noun) the median ridge on the breastbone of birds that fly.

(noun) one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability.

(verb) walk as if unable to control one's movements. Synonyms: stagger, reel, lurch, swag, careen. Examples: "The drunken man staggered into the room."