A more thorough explanation:

Definition: A safe cracker is a person who breaks into a safe, usually to steal what's inside. They are also known as safe breakers. This is different from a safe blower, who uses explosives to open a safe.

• A group of safe crackers robbed a jewelry store and got away with millions of dollars worth of diamonds.
• The police caught a safe cracker trying to break into a bank vault.

These examples illustrate how a safe cracker is someone who uses their skills to break into a safe and steal valuable items. It is illegal and can result in serious consequences.