Shoot down (1) To bring down or kill someone with gunfire. The police were forced to shoot down the armed suspect.

Shoot down (2) To destroy or bring down an aircraft. The military was able to shoot down the enemy plane before it reached its target.

Shoot down (3) To reject or dismiss an idea, proposal, or argument. The lawyer's argument was shot down by the judge. The politician's proposal was shot down by the Senate. The committee shot down his suggestion for a new project.