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Also available:
World English Dictionary
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busy signal
bus·y sig·nal
(
plural
bus·y sig·nals
)
noun
Definition:
sound indicating telephone in use:
a repeating burst of sound on a telephone line that indicates the line is in use
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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