The structure combines "roll up" (to approach casually or in a vehicle) with "on" (indicating direction toward someone), forming a phrasal verb for an unexpected approach. It is used to describe approaching someone, often suddenly or with hostile intent, typically in a car or on foot, to confront, intimidate, or start trouble. People typically say someone "rolled up on" them when a rival gang appears unannounced, or when police pull up without warning.

영어로 "roll up on"의 정의와 의미

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