To Gun

1. (with “down”) To shoot someone or something, usually with a firearm.
2. To speed something up.
3. To offer vigorous support to a person or cause.
4. To seek to attack someone; to take aim at someone.
5. To practice fowling or hunting small game; chiefly in participial form: to go gunning.
6. (transitive, intransitive, prison slang) To masturbate while observing and visible to a corrections officer.