Breakdown of Вот это да!
Questions & Answers about Вот это да!
Literally, the parts are roughly:
- вот = here / there / look / now
- это = this
- да = not really yes here, but an exclamatory particle
So a very literal-feeling gloss would be something like:
- Now that is something!
- Well, this really is...!
But as a whole, Вот это да! is an idiomatic exclamation, so it is usually best understood as something like Wow!, No way!, Well, I’ll be!, or That’s something!, depending on context and tone.