by the by
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by the by
Incidentally; on a side note; by the way. An interjection meant to casually introduce or emphasize additional information in the conversation. Sometimes, though less commonly, written as "by the bye." By the by, I remembered where I left my keys, in case you were wondering. Beckett was an amazing playwright. There's a lecture on his work tomorrow, by the by.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
by the bye
Also, by the by. Incidentally, in passing, as in By the bye, my wife is coming too, or Exactly where do you live, by the by? The bye or second by in this term originally meant "a side path," whence the current sense of "off the track" or "of secondary importance." [Early 1500s] Also see by the way.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
by the by (or bye)incidentally; parenthetically.
Farlex Partner Idioms Dictionary © Farlex 2017
By the way; incidentally.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
by the by/bye
By the way, incidentally, as in “By the by, I saw your brother there as well.” The second by or bye in this archaic-sounding cliché originally denoted a side path, whence the current sense of “in passing.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer