| fogsignal | (noun) a loud low warning signal that can be heard by fogbound ships | Synonyms: foghorn |
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| signal | (adjective) notably out of the ordinary | - |
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| (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signaling, signalling |
| (noun) any incitement to action | - |
| (noun) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signalise, signalize |
| (verb) be a signal for or a symptom of | Synonyms: bespeak, betoken, indicate, point |