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SWING, WAVE, FLOURISH, BRANDISH, THRASH mean to wield or cause to move to and fro or up and down.

SWING implies regular or uniform movement.

e.g. swing the rope back and forth

WAVE usually implies smooth or continuous motion.

e.g. waving the flag

FLOURISH suggests vigorous, ostentatious, graceful movement.

e.g. flourished the winning lottery ticket

BRANDISH implies threatening or menacing motion.

e.g. brandishing a knife

THRASH suggests vigorous, abrupt, violent movement.

e.g. an infant thrashing his arms about

1. no object (of a person, animal, or other living organism) grow or develop in a healthy or vigorous way, especially as the result of a particularly favorable environment:

〈人が〉活躍する, 全盛期である; 〈商売などが〉繁盛する; 〈文化などが〉栄える; 〈悪いものが〉はびこる(prosper)

〈草木が〉繁茂する; 〈動植物が〉よく［すくすく］育つ; 〈人が〉元気である(thrive)

e.g. wild plants flourish on the banks of the lake.

develop rapidly and successfully:

e.g. the organization has continued to flourish.

with adverbial (of a person) be working or at the height of one's career during a specified period:

e.g. the caricaturist and wit who flourished in the early years of this century.

2. with object (of a person) wave (something) around to attract the attention of others:

(目につくように)〈物〉を振りかざす; …を見せびらかす

e.g. “Happy New Year!” he yelled, flourishing a bottle of whiskey.

1. a bold or extravagant gesture or action, made especially to attract the attention of others:

〖通例単数形で〗振りかざす［振り回す］こと; 見せびらかし; 華やかさ

e.g. with a flourish, she ushered them inside.

an elaborate rhetorical or literary expression.

(不要な)装飾, 飾り

an ornamental flowing curve in handwriting or scrollwork:

飾り書き, (文字の)装飾的曲線

e.g. spiky gothic letters with an emphatic flourish beneath them.

2. an instance of suddenly performing or developing in an impressively successful way:

隆盛, 繁栄

e.g. the Bulldogs produced a late second-half flourish.

3. Music a fanfare played by brass instruments:

〖通例単数形で〗〘楽〙 ファンファーレ, 楽曲の盛り上がり［派手なパート］

e.g. a flourish of trumpets.

an ornate musical passage.

装飾楽句

an improvised addition played especially at the beginning or end of a composition.

flourisher noun

Middle English: from Old French floriss-, lengthened stem of florir, based on Latin florere, from flos, flor- ‘a flower’. The noun senses ‘ornamental curve’ and ‘florid expression’ come from an obsolete sense of the verb, ‘adorn’ (originally with flowers).