Walls have ears Definition 1 of 1Pro Tip 1/3Privacy Caution Use this phrase when suggesting that confidential information might be overheard. Discussing our strategies here is risky – walls have ears. Pro Tip 2/3Conversational Warning This phrase is a discrete way to advise someone to speak less freely. I would keep my opinions to myself if I were you; walls have ears. Pro Tip 3/3Hostile Settings Especially relevant in situations where mistrust or surveillance is a concern. In this competitive industry, don't forget that walls have ears.