NoCapWiki editorial explanation
1. What does it mean?
교신 is shortened from 교환 신청 in secondhand-market chats: proposing an item exchange. A seller writing 교신 불가 is saying they do not accept trade offers. 'Trades accepted' or 'no trades' often translates the listing more naturally than 'exchange applications accepted.'
Also written or said as 교환 신청, 교신 불가, trade offer, no trades
2. The nuance
This market meaning is different from the ordinary word 교신 for communicating by signals or radio. Context matters: a photocard listing and a radio-operation article are not talking about the same thing. '교신 가능' invites discussion; it does not guarantee acceptance of every proposed item or a swap without a price difference. Compare 포카 교환, the explicit phrase for exchanging photocards, and 네고, bargaining over a price. Trading items and negotiating a cash price are different requests.
3. Examples
“이 포카는 판매만 하고 교신은 받지 않아요.”
This photocard is for sale only; I'm not accepting trade offers.
“교신 가능하면 원하는 카드가 뭔지 알려주세요.”
If you're open to a trade, please tell me which card you're looking for.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.
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