Where did the phrase it by come from?

The phrase "it by" is not a common or established phrase in the English language. It's likely you're thinking of a phrase that sounds similar, or you've encountered a misspelling.

Here are some possibilities:

* "It's by": This is a common phrase used to indicate something is created or made by someone. For example, "The painting is by Leonardo da Vinci."

* "It's by..." followed by a location: This phrase is used to indicate something is located in a specific place. For example, "The store is by the park."

* "It's by..." followed by a time: This phrase is used to indicate something happens at a specific time. For example, "The meeting is by 3 pm."

If you could provide some context or an example sentence where you heard "it by," I might be able to give you a more accurate answer.