noun
a device that allows someone to secretly listen to or record someone else's telephone conversations
verb
to secretly listen to or record someone else's telephone conversations
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The authorities obtained a court order to conduct a wiretap on the suspect's phone.
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I heard they put a wiretap on his phone to listen in on his conversations.
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The feds are tapping his phone with a wiretap.
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She felt like her thoughts were being wiretapped by her intrusive coworker.