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

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

I don't know with certainty. A: "How many people are coming to dinner tonight?" B: "Hmm, can't say as I do, can't say as I don't." 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:
  • say
  • a fly will not get into a closed mouth
  • a closed mouth gathers no feet
  • you can run, but you can't hide
  • can't have it both ways
  • you, etc. can't have it both ways
  • if you can't beat 'em
  • you can't run with the hare and hunt with the hounds
  • have (one's) bread buttered on both sides
  • have your bread buttered on both sides