Answer:
metaphor
Step-by-step explanation:
Specifically, it uses the metaphor of a "crocodile grin" to describe someone's smile. In this context, the term "crocodile grin" implies that the smile is insincere or deceitful, drawing a comparison between the person's smile and the wide, toothy grin often associated with crocodiles. It suggests that the smile is not genuine and raises suspicions about the person's intentions or sincerity.