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A concealed listening or recording device connected to a communications circuit.
(noun)
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The act of installing such a device.
(noun)
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To connect a concealed listening or recording device to.
(verb-transitive)
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To monitor (a telephone line) by means of such a device.
(verb-transitive)
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To install a concealed listening or recording device or use it to monitor communications.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.