squawk box

noun Informal.
1.
the speaker of a public-address system or an intercom system; loudspeaker.
2.
an intercom system.

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The last one is waist-high, smaller than the others, and resembles a stunted drive-through squawk box.
Chu's job today is to monitor the output from the squawk box.
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