Definition of shoulder surfing in English:

shoulder surfing

noun

informal
  • [mass noun] The practice of spying on the user of a cash-dispensing machine or other electronic device in order to obtain their personal identification number, password, etc.

    • ‘Provided that these brain signals can be recorded and processed in an accurate and repeatable way, a pass-thought system might provide a quasi two-factor, changeable, authentication method resistant to shoulder-surfing.’
    • ‘Bushell believes suggestions that chip and PIN will lead to an increase in shoulder-surfing and street robbery is ridiculous scaremongering.’