flapping verbal noun. ['flapɪŋ] LME.
[from FLAP verb + -ING¹.]
1. The action of FLAP verb. LME.
b. spec. Aeronautics. The angular up-and-down oscillation of the blade of a helicopter about its hinge. M20.

2. A form of racing not subject to the rules of an official body. slang. E20.

[TahlilGaran] English Dictionary ▲