[n] the motion made by flapping up and down
[adj] streaming or flapping or spreading wide as if in a current of air; "ran quickly, her flaring coat behind her"; "a fluttering scarf"; "flying banners"; "flags waving in the breeze"
[adj] moving rapidly and lightly to and fro as of or with wings; "fluttering birds"; "the flittering wings of a fledgling"
[adj] having a slight and rapid trembling motion; "a fluttering heartbeat"; "palpitant movements rather than violent eruptions"; "my palpitating heart"
aflare, flap, flapping, flaring, flittering, flutter, flying, moving, palpitant, palpitating, unsteady, waving