1. to make someone unconscious or dazed by hitting them on the head
2. to shock or surprise someone so much that they cannot react immediately

Examples

• The blow to his head stuns him temporarily.
• The boxer stuns his opponent with a powerful uppercut.
• The news of her promotion stuns everyone in the office.
• The magician’s trick stuns the audience into silence.
• The beauty of the sunset stuns the tourists.
• The unexpected announcement stuns the entire class.
• Lightning stuns the small bird for several minutes.