"flapping" in the noun sense
1. flap, flapping, flutter, fluttering
the motion made by flapping up and down
"flapping" in the verb sense
1. roll, undulate, flap, wave
move in a wavy pattern or with a rising and falling motion
"The curtains undulated"
"the waves rolled towards the beach"
"flags flapped in the strong wind"
3. beat, flap
move with a thrashing motion
"The bird flapped its wings"
"The eagle beat its wings and soared high into the sky"
4. beat, flap
move with a flapping motion
"The bird's wings were flapping"
5. dither, flap, pother
make a fuss be agitated
pronounce with a flap, of alveolar sounds
Source: WordNet® (An amazing lexical database of English)
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