He opened it with a key.

Meaning: He used a small piece of metal with teeth to make the strongbox open.

Choice of Words: Opened means to make or become open. It refers to the treasure chest. With means using or accompanied by something. Key is a small piece of metal with teeth that is used to open a lock.

Alternative Expressions

Related Expressions

• He opened the door with a key.
• She opened the door with a key.
• He opened it with a golden key.
• I opened door with a key.
• He found a tiny key in grass.
• The golden key unlocked the hidden treasure.
• Find the key and unlock the treasure chest.
• They found the tiny key under the rug.
• She memorized the key concepts of the book.
• Instincts guide fish, survival key.