Definition of phreaking noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈfriːkɪŋ//
; NAmE NAmE//ˈfriːkɪŋ//
[uncountable] (informal, especially North American English)
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the act of getting into a communications system illegally, usually in order to make telephone calls without paying Word Origin1970s: alteration of freaking (see freak). The change from f- to ph- was due to association with phone ‘telephone’.
See the Oxford Advanced American Dictionary entry: phreaking