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

phreaking

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