Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Explain the meaning of the idiom 'let the cat out of the bag'.

### Input:
Noinput

### Response:
The idiom 'let the cat out of the bag' means to reveal a secret or an unexpected twist of events, usually unintentionally. It is often used when referring to surprise reveals or surprises that no one was expecting.