de paso

= by the way, by the by(e)

Ex. It is not wise, by the way, to approach the author by telephone for this puts him on the spot and he may refuse simply in self-defense and especially if you happen to butt in when he is struggling with an obstinate chapter in a new book.

Ex. Zenobia, by-the-by, as I suppose you know, is merely her public name.

* * *

= by the way, by the by(e)

Ex: It is not wise, by the way, to approach the author by telephone for this puts him on the spot and he may refuse simply in self-defense and especially if you happen to butt in when he is struggling with an obstinate chapter in a new book.

Ex: Zenobia, by-the-by, as I suppose you know, is merely her public name.