call-waiting

call waiting

noun
a telephone service feature whereby a person engaged in a telephone call is notified by a tone that a second call is being made to the same number, and is able to talk to either party while keeping the other on hold.
Compare hold button.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
call waiting

noun
a way of letting you know that someone else is calling when you are using your telephone 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Call-waiting is always a great word to know.
So is doohickey. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a gadget; dingus; thingumbob.
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