Speaking of which...

Meaning

Used to transition smoothly to a related topic.

Examples

• John: I saw a great documentary about space exploration.
• Alice: Oh, I love that topic! <b>Speaking of which...</b> did you see the news about the new telescope?
• John: No, I haven't. What happened?
• Alice: They made a groundbreaking discovery. <b>Speaking of which...</b>I have the article here.