beg (your) pardon

interjection, 1. a formula of apology or disagreement, 2. a request to repeat something said (“pardon”, COD)

“Beg your pardon, dear.”

“Every how long?”
“Beg pardon?”
“How long between blasts?”

“It’s all mountains and rocks and everything, and we couldn’t find it, so we came back into the little town where we were staying and asked somebody in the street. ‘Oh, well it’s just top over bottom’ and I said, ‘I beg your pardon?’”

“And what about your grandparents?”
“Beg your pardon?”
“Your grandparents?”