by the way
by the way also by the bye {adv. phr.}
Just as some added fact or news; as something else that I think of. — Used to introduce something related to the general subject, or brought to mind by it.
We shall expect you; by the way, dinner will be at eight.
I was reading when the earthquake occurred, and, by the way, it was The Last Days of Pompeii that I was reading.
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Source: A Dictionary of American Idioms