15/07/16 How to Ask People to Repeat
If British people do not hear or understand what is said, they may say Sorry? (GB), What? (informal), (I beg your) pardon? or Pardon me? (US).
“Mike’s on the phone.” “Sorry?” “I said Mike’s on the phone.”
“You’re going deaf.” “I beg your pardon?”
Informally, especially in American English, they may use the phrase Come again?