What is the idiom meaning of to be?

The idiom "to be" doesn't have a single, specific meaning. It's more like a foundation for many other idioms. The meaning depends on the words that follow "to be" and the context of the sentence.

Here are some examples:

* To be at a loss for words: Unable to speak because of surprise, shock, or emotion.

* To be on the same page: To have the same understanding or agreement.

* To be in the mood for: To feel like doing something or having something.

* To be up in the air: To be uncertain or undecided.

* To be out of the woods: To be safe from danger or difficulty.

* To be on thin ice: To be in a risky or precarious situation.

It's important to consider the full sentence and the context when interpreting the meaning of "to be" in an idiom.