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time signal

noun
🔊/ˈtaɪm sɪɡnəl/
🔊/ˈtaɪm sɪɡnəl/
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  1. a sound or sounds that show the exact time of day, especially a series of short, high sounds that are broadcast on the radio（尤指收音机播放的）报时信号Topics TV, radio and newsc2