Definition

1. Adverb:
   • Used to introduce a remark that is not directly related to the main subject of conversation; incidentally: "by the bye" is a transitional phrase that signals the speaker is adding a related or minor point, or changing the topic slightly.

Usage

• The phrase "by the bye" is used in informal speech and writing to interject a secondary thought or piece of information. It functions as a discourse marker to smoothly introduce an aside.
• It is synonymous with "by the way" and "incidentally." The spelling "by the by" is also common.

Examples

• Adverb:

Advanced Usage

• The phrase can be used to return to a previous topic after a digression.
• It can soften the introduction of a potentially sensitive or unexpected comment.

Variants and Related Words

• By the by (adv.): An alternative spelling with identical meaning and usage.
• Incidentally (adv.): In a manner occurring by chance in connection with something else; used similarly to introduce an additional point.
• By the way (adv.): A very common and direct synonym for introducing a related or new topic.

Synonyms

• Incidentally
• By the way
• Parenthetically
• In passing

Related Phrases

• On a related note: Used to introduce a comment connected to the current topic.
• While I think of it: Used to introduce a point the speaker wants to mention before forgetting.

Adverb

1. introducing a different topic; in point of fact
   • incidentally, I won't go to the party