dial tone

(in a telephone) a tone that indicates the line is ready for dialing.


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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dialling tone or (US and Canadian) dial tone
ringing tone Compare engaged tone a continuous sound, either purring or high-pitched, heard over a telephone indicating that a number can be dialled
dial tone or (US and Canadian) dial tone

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Phone shopping is more complicated than it was in the days when a dial tone was
  all you needed.
Barely a decade after cellular phones arrived, cellular channels are so crowded
  that a dial tone is a scarce resource.
He liked to tell people how everyone in the company was amazed to pick up a
  handset and actually get a dial tone.
He ended the conversation by simply hanging up the phone, which went to a dial
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