The Collaborative International Dictionary
Flounce \Flounce\, v. i. [imp. & p. p. Flounced (flounst); p. pr. & vb. n. Flouncing.] [Cf. OSw. flunsa to immerge.] To throw the limbs and body one way and the other; to spring, turn, or twist with sudden effort or violence; to struggle, as a horse in mire; to flounder; to throw one's self with a jerk or spasm, often as in displeasure.
To flutter and flounce will do nothing but batter and
bruise us.
--Barrow.
With his broad fins and forky tail he laves
The rising sirge, and flounces in the waves.
--Addison.
Wiktionary
n. A flounce (strip of decorative material). vb. (present participle of flounce English)
Usage examples of "flouncing".
Gross, horrifying, wattles of excess flesh flouncing on its jowly face, it advanced across the courtyard.
In and out of the trees it gamboled, the long tail flouncing high—everywhere they turned the horse frisked in their way, its spell drawing its net over them, until in desperation Imrhien brandished her ashen staff in both hands, right before its eyes.
Derec slept on his side of the room, and Ariel slept on hers, but they didn't sleep much, keeping each other awake by tossing and turning, and generally flouncing around to enhance the other's anger.