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.
BY THE WAY
Meaning of BY THE WAY in English
American idioms English vocabulary. Английский словарь американских идиом. 2012