1. well-equipped with weapons; carrying many weapons; heavily armed with deadly weapons

1. The police won’t enter the bank where the thief is. He’s armed to the teeth.

2. The invading soldiers were armed to the teeth. There was no way the defenders could hope to win.

3. There are too many guns around. The entire country is armed to the teeth.

4. The bank robber was armed to the teeth when he was caught.