What is the meaning of idiom to birth?

The idiom "to birth" is not a standard idiom in English. The word "birth" itself means the act of being born or the beginning of something.

However, it's possible you're thinking of a related phrase, such as:

* "Give birth": This is the most common usage and means to deliver a baby.

* "To give birth to an idea": This is a metaphorical usage, meaning to create or develop a new idea or concept.

If you can provide more context about how you heard the phrase "to birth", I might be able to help you understand its intended meaning.