An automatic signal (usually a sound) warning of danger.
Visual or audible signal indicating potential or acute danger.
1 These brilliant colours serve as a visual warning signal to would-be predators.
2 The warning signal that it was approaching the open road crossing at Collyweston.
3 A beeping warning signal sounded inside his cockpit as he armed his missiles.
4 The engineer saw the warning signal and slowed down, but did not stop.
5 It was too late to give her aunt a warning signal .
6 Officials said the driver ignored a warning signal and crossed onto the rail tracks.
7 In a moment the warning signal for lift-off was given.
8 Volumes during the rally had been weak, which was a warning signal , he said.
9 I must give the first warning signal to Crawford; and he fired off a musket.
10 It was so clearly an early warning signal for the impacts that Clade was exploring.
11 No warning signal was raised on the bluffs; not a hand was stirred to rescue.
12 The whistle is still a bit faint, but it is sending a clear warning signal .
13 This warning signal has a fairly accurate track record.
14 It said the pilots were unaware of the malfunction because a cockpit warning signal failed.
15 Tarzan did not repeat his warning signal , but instead rushed bodily upon the waiting Terkoz.
16 Suddenly, without any warning signal , apparently, all the air traffic went wild-thenit was gone.
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