Idiom of the day :- Walls have ears

Usage, examples and definition of the Idiom :-

If you have a secret or information that you’d like to keep private, it’s well to take care how you reveal it to someone. Walls have ears. It is said and too often our most intimate conversations have a way of being overheard. ‘Pass this on to Julia — but be careful about it. Remember, the walls have ears,’ Agnes whispered.