meok-tong-i doe-da
to freeze up, become unresponsive
phrase
휴대폰이 갑자기 먹통이 돼서 전화를 받을 수 없었어요.
My phone suddenly stopped working, so I couldn't answer the call.
카톡이 먹통이 되면 답장을 보낼 수 없잖아요.
If KakaoTalk goes down, you can't send messages, right?
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