The store installed more cameras to prevent customers from shoplifting.

shoplifting 是由名词 shop（商店）和动词 lift（举起、偷窃）组成的复合词，加上-ing 后缀构成动名词形式。字面意思是"在商店里偷窃"，特指顾客在商店内顺手牵羊的行为。