speaking of

副詞

口語

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

日本語の意味

〜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？

意味（1）

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

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