Webster's Revised Unabridged Dictionary · 1913

Flounce

Flounce , intransitive verb

[Compare 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

Flounce , noun

The act of flouncing; a sudden, jerking motion of the body.

Flounce , noun

[Compare German flaus, flausch, a tuft of wool or hair; akin to vliess, English fleece; or perh. corrupted from rounce.]

An ornamental appendage to the skirt of a woman's dress, consisting of a strip gathered and sewed on by its upper edge around the skirt, and left hanging.

Flounce , transitive verb

To deck with a flounce or flounces; as, to flounce a petticoat or a frock.