Walls have ears
Be careful what you say — someone may be listening.
English
Walls have ears
Tiếng Việt
Tai vách mạch rừng.
Cẩn thận lời nói, biết đâu có người đang nghe.
Ví dụ
- She lowered her voice in the corridor — walls have ears.
- Don't discuss it here; walls have ears.