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1. Oxford American Dictionary

   keel

   • IPA[kēl]

   美式

   • n.
     the longitudinal structure along the centerline at the bottom of a vessel's hull, on which the rest of the hull is built, in some vessels extended downward as a blade or ridge to increase stability.；a ridge along the breastbone of many birds to which the flight muscles are attached; the carina.
   • v.
     (of a boat or ship) turn over on its side; capsize；(of a person or thing) fall over; collapse

   • verb: keel, 3rd person present: keels, gerund or present participle: keeling, past tense: keeled, past participle: keeled

   • noun: keel, plural noun: keels

2. • 釋義

   n.

   名詞

   • 1. the longitudinal structure along the centerline at the bottom of a vessel's hull, on which the rest of the hull is built, in some vessels extended downward as a blade or ridge to increase stability.
   • ▪ a ridge along the breastbone of many birds to which the flight muscles are attached; the carina.
   • ▪ a prow-shaped pair of petals present in flowers of the pea family.
   • ▪ a ship.

   v.

   動詞

   • 1. (of a boat or ship) turn over on its side; capsize it's going to take more wind to make this boat keel over
   • ▪ (of a person or thing) fall over; collapse a wardrobe was about to keel over on top of him