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Related to swing by: drop by
To visit someone or some place casually and/or briefly. Just swing by when you get a chance—I'll be here all day. I need to swing by the grocery store on my way home.
To visit some place for a brief amount of time, especially as a deviation from a direct course: On my way home, I swung by the post office to buy some stamps. We swung by a friend's house on our way to the beach. Why don't you swing by for some coffee?