By the by
Academic discourse marker used to connect ideas
Literally: By the (side of) the by (way)
In 15 Seconds
- A polite bridge to introduce an afterthought or side-note.
- More formal and elegant than the common 'by the way'.
- Used at the start of a sentence for smooth transitions.
- Perfect for professional emails and sophisticated social chats.
Meaning
By the by is a sophisticated way to introduce a side-note or a topic that isn't your main focus. It feels like a polite, slightly old-fashioned bridge between two thoughts. You use it when you want to mention something extra without making it seem too important.
Key Examples
3 of 10Ending a work meeting on Zoom
I'll send the notes shortly. By the by, I'm taking Friday off.
I'll send the notes soon. By the way, I'm taking Friday off.
Texting a friend about a movie
The ending was so sad! By the by, have you seen the sequel?
The ending was so sad! Incidentally, have you seen the second movie?
Writing a polite email to a colleague
Thanks for the feedback. By the by, the office printer is fixed.
Thanks for the feedback. Also, the office printer is fixed.
Cultural Background
In the UK, 'by the by' is often used to maintain 'social grease'—it allows people to bring up potentially awkward topics (like money or health) in a way that seems accidental and therefore less intrusive. In academic circles, the phrase is used to introduce 'footnotes' in speech. It signals that the speaker has more knowledge but doesn't want to derail the main lecture. The phrase is a hallmark of 19th-century novels. Modern readers often encounter it in Jane Austen or Dickens, where it characterizes the 'polite society' of the era. In high-end corporate environments (law, consulting), 'by the by' is used to show a level of linguistic polish that 'by the way' lacks.
The 'Classy' Factor
Use 'by the by' in a cover letter to mention a secondary skill that isn't required but is a nice bonus.
Don't Overuse
Using it more than once in a conversation can make you sound like a character from a 19th-century novel.
In 15 Seconds
- A polite bridge to introduce an afterthought or side-note.
- More formal and elegant than the common 'by the way'.
- Used at the start of a sentence for smooth transitions.
- Perfect for professional emails and sophisticated social chats.
What It Means
Ever felt like you needed to mention something small without ruining the flow of a great chat? By the by is your secret weapon for that exact moment. It functions as a gentle signal to your listener. It says, 'Hey, this next part is just an afterthought.' It is the verbal equivalent of a soft nudge during a walk. You aren't changing the destination. You are just pointing out a pretty flower on the side of the path. It’s elegant, a bit vintage, and very smooth. Using it suggests you have a refined grasp of English. It's like wearing a monocle, but much less heavy on your face.
How To Use It
You place this phrase at the very start of a sentence. It acts as a transition. First, finish your main point about the current topic. Then, drop a quick by the by. Finally, add your secondary piece of information. It works best when the new info is loosely related to the current topic. Think of it as a 'soft' version of by the way. It creates a pause that lets your audience catch their breath. Use it when you want to sound thoughtful rather than rushed. It's perfect for those 'oh, I almost forgot' moments in a conversation. Don't use it to drop a massive bombshell, though. That would be like putting a bowling ball in a silk sock.
Formality & Register
This phrase sits comfortably in the 'neutral-to-formal' category. It is more sophisticated than the standard by the way. You will find it in literature, professional emails, and polite social gatherings. It carries a British, slightly academic vibe. If you use it in a casual text, you might sound a bit fancy. That isn't necessarily a bad thing! It can add a touch of charm to a mundane message. However, in a very formal legal document, it might be too conversational. Use it to bridge the gap between being professional and being friendly. It makes you sound like the kind of person who knows which fork to use at a fancy dinner.
Real-Life Examples
Imagine you are finishing a Zoom call with your boss. You've discussed the quarterly goals. Just as you are about to hang up, you say, 'By the by, I’ll be out next Friday.' It feels less jarring than a blunt announcement. Or think about a travel vlog. The creator is talking about a museum. Then they say, 'By the by, the coffee shop next door is amazing.' It adds value without distracting from the main story. You might also see it in a polite Slack message. 'I've attached the report. By the by, did you see the new office cat?' It keeps the workplace vibe human and warm. It’s the ultimate tool for the 'hidden' PS in your speech.
When To Use It
Use it when you want to add a detail that isn't crucial. It’s perfect for social networking events. You can use it to mention a mutual friend after finishing business talk. It's also great for emails where you want to ask a small favor. Use it when you want to transition between two topics gracefully. If you feel like your conversation is getting too intense, use it to lighten the mood. It's a great way to show you are relaxed and in control. Use it when you want to sound like a native speaker with a broad vocabulary. It’s the 'smooth operator' of the English language.
When NOT To Use It
Avoid using it for life-changing news. You wouldn't say, 'By the by, I'm moving to Mars tomorrow.' That's too casual for such a big event! Don't use it in high-stress, emergency situations. If the building is on fire, don't say, 'By the by, the exit is that way.' Just point and run! It’s also not suitable for very aggressive arguments. It sounds too polite for a shouting match. If you are using slang like lit or fam, by the by will feel out of place. It’s like wearing a tuxedo to a beach party. You’ll look cool, but everyone will be confused.
Common Mistakes
Don't mix it up with 'by and by.' That actually means 'eventually' or 'later.' It’s a very common trap! Another mistake is using it as a question. You can't just say 'By the by?' and wait for an answer. It must introduce information. Some people also forget the second the. Saying 'by the' or 'by by' sounds like you are saying goodbye to someone. Make sure you don't use it too many times in one chat. If you use it five times, you’ll sound like a malfunctioning robot from the 1920s. Stick to once per conversation for maximum effect. Accuracy is the name of the game here.
Common Variations
The most common cousin is by the way. Everyone knows that one. Then there is incidentally. That one is even more formal and academic. Parenthetically is the 'final boss' of this category. It’s very rare and sounds like a textbook. On the casual side, we have anyways or oh, also. These are fine for texting your best friend. In British English, you might hear as it happens. In very old books, you might see apropos of nothing. But by the by hits that perfect sweet spot. It is elegant without being arrogant. It's the Goldilocks of transitions.
Real Conversations
Sarah
Mark
Sarah
By the by, did you hear that Jane got promoted?Mark
Tom
Leo
Tom
By the by, don't forget your locker key this time.Leo
Quick FAQ
Is it the same as 'by the way'? Yes, the meaning is nearly identical. However, by the by is more formal and sounds slightly more literate. Can I use it in an American context? Absolutely! While it has British roots, Americans use it to sound more articulate. Is it old-fashioned? A little bit, but that is part of its charm. It makes you stand out in a world of 'anyway.' Can I use it to start a conversation? Usually no. It is a bridge, so you need a 'first bank' to build from. It’s best used after you’ve already started talking about something else.
Usage Notes
Use 'by the by' when you want to appear articulate and polite. It fits perfectly in professional settings or literary discussions. Be careful not to use it for urgent news, as it signals that the information is merely a side-note.
The 'Classy' Factor
Use 'by the by' in a cover letter to mention a secondary skill that isn't required but is a nice bonus.
Don't Overuse
Using it more than once in a conversation can make you sound like a character from a 19th-century novel.
The Comma Rule
Always put a comma after 'by the by' if it starts your sentence. It helps the reader pause and prepare for the side-note.
Examples
10I'll send the notes shortly. By the by, I'm taking Friday off.
I'll send the notes soon. By the way, I'm taking Friday off.
Uses the phrase to gently announce personal news after business.
The ending was so sad! By the by, have you seen the sequel?
The ending was so sad! Incidentally, have you seen the second movie?
Transitions from an emotional reaction to a related question.
Thanks for the feedback. By the by, the office printer is fixed.
Thanks for the feedback. Also, the office printer is fixed.
Adds a helpful piece of office news as an afterthought.
Sunset in Rome was magic. By the by, the gelato here is 10/10.
Sunset in Rome was magic. Also, the ice cream here is perfect.
Adds a casual recommendation to a poetic post.
I really enjoy team projects. By the by, I also have experience in SQL.
I enjoy team projects. Additionally, I have experience in SQL.
Adds a relevant skill without it feeling like a forced list.
The steak is delicious. By the by, does anyone else think the waiter looks like Batman?
The steak is great. By the way, does the waiter look like Batman?
Breaks the mood with a funny, unrelated observation.
✗ By and by, did you finish the report? → ✓ By the by, did you finish the report?
Incidentally, did you finish the report?
'By and by' means 'eventually,' which doesn't fit here.
✗ The by by, I forgot my keys. → ✓ By the by, I forgot my keys.
By the way, I forgot my keys.
The article 'the' must be between the two 'by's.
Please leave it at the gate. By the by, the doorbell is broken.
Please leave it at the gate. Also, the doorbell doesn't work.
Provides a useful detail after the main delivery instruction.
I'm so proud of your progress. By the by, your mother says hello.
I'm proud of you. Also, your mother says hi.
Transitions from a deep topic to a light greeting.
Test Yourself
Fill in the blank with the correct phrase to introduce a polite side-note.
The report is finished. ________, did you see the email about the office move?
'By the by' is used for incidental side-notes. 'By and by' means eventually.
Which sentence uses 'by the by' in the most appropriate register?
Choose the best option:
'By the by' is best suited for formal or professional contexts where a polite transition is needed.
Match the phrase with its meaning.
Match the following:
Each phrase has a specific nuance regarding time or relevance.
Complete the dialogue with the most sophisticated transition.
A: 'I'll see you at the gala tonight.' B: 'I'll be there. ________, is it a black-tie event?'
'By the by' fits the formal context of a gala.
🎉 Score: /4
Visual Learning Aids
Practice Bank
4 exercisesThe report is finished. ________, did you see the email about the office move?
'By the by' is used for incidental side-notes. 'By and by' means eventually.
Choose the best option:
'By the by' is best suited for formal or professional contexts where a polite transition is needed.
Match each item on the left with its pair on the right:
Each phrase has a specific nuance regarding time or relevance.
A: 'I'll see you at the gala tonight.' B: 'I'll be there. ________, is it a black-tie event?'
'By the by' fits the formal context of a gala.
🎉 Score: /4
Video Tutorials
Find video tutorials on YouTube for this phrase.
Frequently Asked Questions
10 questionsYes, but it is much less common than 'by the way.' It is mostly found in formal writing, academic contexts, or among speakers who prefer a more traditional style.
You can, but it might look a bit formal. Most people use 'BTW' or 'by the way' in texts.
They are very similar. 'Incidentally' is slightly more formal and often used to connect two related ideas, while 'by the by' is used for a more casual side-note.
No. 'By and by' means soon or eventually. 'By the by' means incidentally.
It is used in both, but it is more commonly associated with British English and the 'polite' register of the UK middle class.
Yes, 'bye' is an older spelling of the same phrase, but 'by the by' is the standard modern spelling.
Usually after the phrase if it's at the start of a sentence: 'By the by, I like your shoes.'
Yes, it can sound very professional if used to introduce a relevant but secondary piece of information.
No, it is the opposite of slang. It is a formal, traditional expression.
It's rare. Usually, it's at the beginning or in the middle as an aside.
Related Phrases
By the way
synonymThe most common way to introduce a side-note.
Incidentally
similarUsed to introduce a point that is related to the current topic.
By and by
contrastIn a short time; eventually.
Apropos of nothing
specialized formIntroducing a topic with no connection to the previous one.