armed to the teeth

equipped with several weapons

The idiom "armed to the teeth" likely originated from the image of someone being so heavily armed that they have weapons in their hands, on their belt, in holsters, and even in their mouth. It is used to describe a person or group that is excessively or overwhelmingly armed with weapons, often to emphasize their readiness for a confrontation or battle.

The soldiers were armed to the teeth with rifles, grenades, and body armor as they approached the enemy camp.
He walked into the negotiation room armed to the teeth with facts, figures, and a compelling argument.
The security team was armed to the teeth to protect the VIP during the high-risk event.
In the online gaming tournament, he entered the final round armed to the teeth with powerful upgrades and strategies.
The cybersecurity system was armed to the teeth with firewalls and encryption, making it nearly impenetrable to cyberattacks.