(I) can't say as I do

(I) can't say as I do

I don't know with certainty. A: "Do you know how many people are coming to dinner tonight?" B: "Hmm, can't say as I do." They asked me if I know how to create a spreadsheet like that, but I can't say as I do.
See also: say
Farlex Dictionary of Idioms.

can't say as I do, (can't say as I don't)

Rur. I am not sure. Tom: Do you know Mr. Smith? Mary: Well, I can't say as I do, can't say as I don't. Jane: What do you think of my cousin? Do you like him? Mary: Can't say's I do, can't say's I don't.
See also: say
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • can't say as I do
  • (I) can't say's I do
  • (I) can't say as I do(, can't say as I don't)
  • as we know it
  • AFAIK
  • as you know
  • don't say it
  • Don't say it!
  • closed book, a
  • a closed book