Select the most appropriate meaning of the given idiom.

Out of the blue

Completely unexpectedly

The most appropriate meaning of the idiom "out of the blue" is completely unexpectedly.

This idiom is used to describe something that happens suddenly and without warning. For example, you might say "The news of her death came out of the blue." This means that it was a shock to everyone who knew her.

The other options are not as accurate descriptions of the meaning of the idiom.

• Found commonly: This is more accurately described by the idiom "a dime a dozen."
• Act cleverly: This is more accurately described by the idiom "to be resourceful."
• Go away secretly: This is more accurately described by the idiom "to sneak away."