brandish [ˈbrændɪʃ]

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vt.挥舞，挥动；n.挥动，挥舞

to wave something in the air in a threatening or excited way

She answered with a brandish of her umbrella. 她挥动着伞回答。
Come on together! Brandish the florid youth together! 一起舞动绚丽的青春吧！