I declare!

I (do) declare!

This is surprising! Why, John Miller, I do declare! I didn't expect to see you here! A: "Did you hear that Thomas and Millie got engaged?" B: "I declare! I didn't realize things were so serious between them."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

I (do) declare!

Inf. I am surprised to hear that! (Old-fashioned.) Mary: I'm the new president of my sorority! Grandmother: I declare! That's very nice. A plane had landed right in the middle of the cornfield. The old farmer shook his head in disbelief. "I do declare!" he said over and over as he walked toward the plane.

I declare (to goodness)!

Rur. What a surprise! I declare to goodness! You certainly have grown since I saw you. Tom: Jim and Sally are going to get married. Mary: Well, I declare!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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