shoplifter       
noun [ C ] uk/ˈʃɒp.lɪf.tər/ us/ˈʃɑːp.lɪf.tɚ/
 店内扒手
a person who takes goods illegally from a shop without paying for them
  Shoplifters will be prosecuted.
 He spent thousands on security cameras and alarms to deter shoplifters.  他花费了数千元购买安全摄像头和警报器,以阻止店内扒手。 
 See: shoplifting
 - More examples
 - Most of the suspected shoplifters have criminal records.
 - Police are sending letters to convicted shoplifters warning them to stay out of trouble.
 - Shoplifters are caught almost exclusively by private security officers working for the retailer.