Definitions

1. noun

A group of people authorized by law to make arrests, especially police officers in pursuit of a suspect, or a group of people acting together, especially in pursuit of a common goal.

“The police formed a posse to track down the escaped prisoner.”

2. noun

A group of people, especially in the American Old West, who would form a band or party for a specific purpose, such as hunting or law enforcement.

“The ranchers formed a posse to deal with the rustlers.”

3. noun

A group of people who are united in a particular cause or activity.

“The art enthusiasts formed a posse to promote the local art scene.”

4. verb

To form or join a group of people for a specific purpose.

“The volunteers posse up to help with the disaster relief.”