“Can you tell him to swing by my office when he gets a chance?”
You want to talk to one of your co-workers. You go to talk to him, but he's not at his desk. You ask another co-worker to give him a message, and the message is like this.
Can you tell him to swing by my office when he gets a chance?
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swing by (somewhere)
"Swinging by" a place means visiting it quickly before going somewhere else. It's very similar to "stopping by":
But when someone says "swing by", it's even more casual and the visit sounds even shorter. You can tell someone to "swing by" a place when you want the trip to sound short and easy.
when (someone) gets a chance
When you ask people to do something, this phrase lets them know that they don't have to do it immediately. They can do it at a time that's convenient for them.
Here's an example:
Can you help me with this when you get a chance?
If you leave "when you get a chance" off, it sounds like you want immediate help:
Can you help me with this?