a person or group of people who stand outside a workplace or other venue as a protest or to try to persuade others not to enter during a strike

forty pickets were arrested

a soldier or small group of soldiers performing a particular duty, especially one sent out to watch for the enemy

when would this headlong advance run into the enemy pickets?

a picket of soldiers fired a volley over the coffin

a pointed wooden stake driven into the ground, typically to form a fence or to tether a horse

a cedar-picket stockade

act as a picket outside (a workplace or other venue)

strikers picketed the newspaper's main building

18,000 people turned up to picket