They watched in astonishment as the little knight tugged his sword out of its scabbard and began brandishing it violently, hopping up and down in rage.
He drank a bit of tea and watched the grindylow brandishing a fist at him.
Pettigrew flinched as though Black had brandished a whip at him.
Threequarters of the crowd was wearing scarlet rosettes, waving scarlet flags with the Gryffindor lion upon them, or brandishing banners with slogans like "GO GRYFFINDOR!" and "LIONS FOR THE CUK’ Behind the Slytherin goal posts, however, two hundred people were wearing green; the silver serpent of Slytherin glittered on their flags, and Professor Snape sat in the very front row, wearing green like everyone else, and a very grim smile.
There are no more uses of "brandish" in the book.
Show samples from other sources
She brandished a sword.
She tossed her new weapon up in the air, caught it again, brandished it, and urged the horse forward.