“隔墙有耳”，汉语成语，意思是隔着一道墙，也有人偷听（someone may be listening on the other side of the wall）。比喻即使秘密商量，别人也可能知道，也用于劝人说话小心，免得泄露。与英文谚语“walls have ears”意思相同，表示“somebody may be listening, so be careful what you say”。
- 别在这里聊生意上的事情，隔墙有耳。
Don't say anything about our business dealings in here. Walls have ears. - 你最好小点声，要知道隔墙有耳。
You’d better keep your voice down. Walls have ears, you know.
