[wahyuh r-tap]
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verb (used with object), wire·tapped, wire·tap·ping.
  1. to obtain (information, evidence, etc.) by tapping telephone or telegraph wires: to wiretap conversations.
  2. to listen in on by means of a wiretap: to wiretap a telephone; to wiretap a conversation.
verb (used without object), wire·tapped, wire·tap·ping.
  1. to tap telephone or telegraph wires for evidence, information, etc.
  1. pertaining to or obtained by wiretap.

Origin of wiretap

First recorded in 1950–55; back formation from wiretapper
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for wiretap


verb -taps, -tapping or -tapped
  1. to make a connection to a telegraph or telephone wire in order to obtain information secretly
Derived Formswiretapper, nounwiretapping, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012