Select the most appropriate meaning of the given idiom.

Spill the beans

Reveal a secret

The most appropriate meaning of the idiom "spill the beans" is reveal a secret. It is used to describe the act of disclosing something that was meant to be kept confidential. The idiom comes from the idea of spilling beans out of a container, which would reveal what was inside.

The other options are not correct.

• Reveal a plan: This can be part of spilling the beans, but it is not the whole meaning.
• Reveal a crime: This can be part of spilling the beans, but it is not the whole meaning.
• Reveal a mystery: This can be part of spilling the beans, but it is not the whole meaning.