speaking of

Adverb

colloquial

(colloquial) Speaking of which; relatedly, used to introduce a related topic.

Japanese Meaning

〜と言えば / その話に関連して / ちなみに

I ran into Mark at the supermarket, and speaking of old friends, do you remember Emma?

スーパーでマークに会ったんだけど、そういえば昔の友達のエマを覚えてる？

Sense（1）

(colloquial) Speaking of which; relatedly, used to introduce a related topic.

Speaking of by the way: nice car. I mean that.