Meaning of “pardon” - Learner’s Dictionary

pardon

exclamation uk us /ˈpɑːdən/

A2 (also US pardon me) a polite way of asking someone to repeat what they have just said:

"You'll need an umbrella." "Pardon?" "I said you'll need an umbrella."
Pardon me.

used to say 'sorry' after you have done something rude, for example after burping (= letting air from your stomach out of your mouth)

(Definition of “pardon exclamation” from the Cambridge Learner’s Dictionary © Cambridge University Press)