Definition of shoulder surfing noun from the Oxford Advanced Learner's Dictionary


shoulder surfing

BrE BrE//ˈʃəʊldə sɜːfɪŋ//
; NAmE NAmE//ˈʃoʊldər sɜːrfɪŋ//
[uncountable] (informal)
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the practice of watching a person who is getting money from a machine, filling out a form, etc., in order to find out their personal information The PIN numbers were obtained by shoulder surfing. Learn how to spot shoulder surfing.
See the Oxford Advanced American Dictionary entry: shoulder surfing