by the by

English dictionary entry

Meanings

prep_phrase
  1. Used to introduce a new topic; incidentally, by the way.
adj
  1. Incidental; unplanned.

Word forms

by the by by the bye by-the-by by-the-bye more by the by most by the by

Etymology

The second "by" is a noun meaning "a secondary issue". Phrase used since the 17th century.

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