flipper

ot noun

1. In marine mammals such as whales, a wide flat limb, adapted for swimming.
2. A flat, wide, paddle-like rubber covering for the foot, used in swimming.
3. A flat lever in a pinball machine, triggered by the player to strike the ball and keep it in play.
4. A small flat used to support a larger one.

fe’l verb

1. To lift one or both flippers out of the water and slap the surface of the water.