What does the idiom it down mean?

The idiom "it's down" doesn't have a specific meaning in itself. It's likely a shortened or informal version of a phrase that needs more context to understand its meaning.

Here are some possible meanings depending on the situation:

1. "It's down" as a simple statement of a system being offline:

* Context: "Hey, is the internet down?" "Yeah, it's down."

* Meaning: Something is not working, typically referring to technology like websites, networks, or devices.

2. "It's down" as a statement of something being unavailable:

* Context: "Are you going to the party tonight?" "I don't know, it's down to how I feel."

* Meaning: The decision is uncertain, dependent on other factors.

3. "It's down" as a way of indicating something is decreased or reduced:

* Context: "How's the business doing?" "It's down a bit this month."

* Meaning: The business is performing less well than usual.

4. "It's down" as a shortened version of a phrase:

* Context: "He's been down in the dumps lately."

* Meaning: The person is feeling sad or depressed.

To accurately understand the meaning of "it's down," you need to consider the context in which it's used.

Do you have an example sentence where you heard or read this phrase? I might be able to give you a more precise interpretation then.