shoplifter
US /ˈʃɑːp.lɪf.tɚ/
UK /ˈʃɑːp.lɪf.tɚ/

1.
a person who steals goods from a shop while pretending to be a customer
:
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The security guard caught the shoplifter trying to leave with unpaid items.
•
Many stores use surveillance cameras to deter shoplifters.