Search Result for "warning signal":
Wordnet 3.0

NOUN (1)

1. an automatic signal (usually a sound) warning of danger;
[syn: alarm, alert, warning signal, alarum]



WordNet (r) 3.0 (2006):

warning signal
    n 1: an automatic signal (usually a sound) warning of danger
         [syn: alarm, alert, warning signal, alarum]