to listen repeatedly; to listen again
to ask a question in return
to ask again; to ask for a repeated explanation
相手の言葉を聞き返した。
I asked the other person to repeat what they said.
何度も聞き返している。
I keep asking to hear it again.
聞き取れなかったので聞き返すことにした。
I couldn't catch it, so I decided to ask again.