Brandish (verb)

1. To wave or shake (something) menacingly.
2. To flourish or exhibit (something) in a bold or showy manner.

Origin:

From middle english brandisshen, from old english brandiscian, from brand "sword".

Examples:

1. The angry man brandished a knife at the store clerk and demanded money.
2. During the parade, the cheerleaders brandished their pom-poms, leading the crowd in a series of chants and cheers.
3. The actor brandished his sword on stage, performing dramatic fencing moves.
4. The politician brandished his credentials, trying to impress the crowd.
5. The demonstrators brandished signs and marched through the streets, calling for social and political change.