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English definition of “signal”

signal

noun [C] (ACTION)   /ˈsɪɡ·nəl/
an action , movement , or sound that gives information , a message , a warning , or an order : I tried to call but kept getting a busy signal. When the lieutenant gave the signal, five police officers charged into the apartment . In retrospect , looking at how she was acting , we should have been able to recognize the danger signals. A signal is also a device , often with lights , that shows people or vehicles whether to stop , go, or move carefully .
(Definition of signal noun (ACTION) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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