speaking ofとは

副詞

speaking of

1. (colloquial) Speaking of which; relatedly; used to introduce a related topic.
   • 2006, Mark Winegardner, The Godfather’s Revenge (novel), G.P. Putnam’s Sons, ↑ISBN, page 76:

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

   • 2009, Wells Tower, “Executors of Important Energies” (short story), in Everything Ravaged, Everything Burned, Macmillan, ↑ISBN, page 83:

     “No more songs. This is a restaurant, for Christ’s sake, and speaking of, can somebody tell me where the hell is that veal?”

   • 2009, James Boice, NoVA (novel), Simon and Schuster, ↑ISBN, page 47:

     — […] Speaking of by the way we should go shopping on Saturday or Sunday because Penney’s is having a sale at Fair Oaks.

   • 2010, Julia DeVillers and Jennifer Roy, Take Two (novel), Simon and Schuster, ↑ISBN, page 8:

     “ […] And speaking of, can you please cover up that hideous shirt?”