1. Be alert to this danger signal.

2. A red lamp is used as a danger signal.

3. A red flag is often used as a danger signal.

4. Arteriosclerotic retinopathy is a danger signal that the blood vessels in the body are Arteriosclerotic and that steps are badly needed to prevent the progression of the disease process

5. Alarums) (archaic) A danger signal or warning.1913, George Bernard Shaw, Pygmalion: "The rest is the irreducible minimum of poverty's needs: A wretched bed heaped with all sorts of coverings that have any warmth in them, a