from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A low, steady tone in a telephone receiver indicating that a number may be dialed.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
telephony signal, usually in the form of a sound, used to indicate that the telephone exchangeis working, has recognized an off-hook, and is ready to accept a call.
Sorry, no etymologies found.
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