The buttocks, the anus.
The suspended clapper of a bell.
A condom.
An unregistered car.
Something outstanding or exceptional, a humdinger.
A home run.
One who rings a bell.
A catapult, a shanghai.
A bell or chime.
The penis.
Any small dolphin.
A small cetacean of the family Phocoenidae, related to dolphins and whales.
Said of an air-breathing aquatic animal such as a porpoise or penguin: To repeatedly jump out of the water to take a breath and dive back in a continuous motion.
Said of an aircraft: to make a series of plunges when taking off or landing; or of a watercraft: to successively plunge up and down in the water.