Usually means: Incidental remark during a conversation.
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We found 13 dictionaries that define the word by the by:

General (10 matching dictionaries)
  1. by the by: Merriam-Webster
  2. by the by: Oxford Learner's Dictionaries
  3. by-the-by, by the by: Wiktionary
  4. by the by: Dictionary.com
  5. By-the-by: Dictionary of Phrase and Fable (1898)
  6. by the by: FreeDictionary.org
  7. by the by: TheFreeDictionary.com
  8. by the by: Longman Dictionary of Contemporary English

Business (1 matching dictionary)
  1. by the by: Financial dictionary

Computing (1 matching dictionary)
  1. by the by: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. by the by: Idioms

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Definitions from Wiktionary (by the by)

▸ adjective:  Incidental; unplanned.

Similar:
incidental, apropos, adventitious, crabwise, serendipitous, offhand, casual, ad hoc, untimely, sometime, more...

Opposite:
by way, incidentally, as aside, on related note

Phrases:
Live by the sword, die by the sword, more...

Adjectives:
beside the point, tangential, incidental, indirect, half, incident, provisory, sundry, case-by-case, en passant

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Similar:
incidental, apropos, adventitious, crabwise, serendipitous, offhand, casual, ad hoc, untimely, sometime, more...

Opposite:
by way, incidentally, as aside, on related note

Phrases:
Live by the sword, die by the sword, more...

Adjectives:
beside the point, tangential, incidental, indirect, half, incident, provisory, sundry, case-by-case, en passant



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