flapper

noun8

1. •
   One who or that which flaps.
2. •
   (informal, historical) A young woman, especially when unconventional or without decorum or displaying daring freedom or boldness; now particularly associated with the Jazz Age of the 1920s.

   • I paid violent and unusual attention to a flapper all through the meal in order to make you jealous. She's probably in her cabin writing reams about me to a fellow-flapper at this very moment. — 1910
3. •
   A flipper; a limb of a turtle, which functions as a flipper or paddle when swimming.

   • It was still too shallow for the turtle to swim, but it used its four flappers with so much effect against its two assailants, as to give them a thorough shower-bath. — 1878
4. •
   A flapper valve.

   • In this case, slide the collar of the flapper over the overflow tube until it seats against the bottom of the flush valve. — 2004
5. •
   (informal, historical) A young girl usually between the ages of 15 and 18, especially one not "out" socially.

   • Stud's eyes roved. Plenty of girls, most of them young flappers, Loretta's age. Only a couple of years ago they were kids. — 1934
6. •
   Any injury that results in a loose flap of skin on the fingers, making gripping difficult.
7. •
   A young game bird just able to fly, particularly a wild duck.
8. •
   (slang) The hand.