walls have ears
1
used to imply that one should be careful about what is said in private, as there may be others listening or eavesdropping
The origin of the proverb "walls have ears" is uncertain, but it has appeared in various forms across cultures. It serves as a reminder that, regardless of the environment, others may be able to overhear conversations, so it is wise to speak with discretion and avoid saying anything that could be misinterpreted or cause unintended consequences.
- The spies were cautious about their conversations, knowing that walls have ears and any information leaked could be used against them.