Wiktionary
swing by
vb. (context ambitransitive informal English) To pay a brief, informal visit.
Usage examples of "swing by".
They said they're going to charge you a late fee if you don't swing by and pick up your laundry today.
She let the amulet drop, to swing by its chain as she drew her dagger.
She spent most of her off-duty hours in the team room, staring vacantly into glasses of synthehol and making polite chitchat with those people who opted to swing by and extend their condolences.
One last task, before he collapsed in his quiet, private space on the back fire escape, was to swing by the Coke machine and hope for the best.
I swear, and I call on God and all his saints to witness, I swear that I will never rest again until you swing by the neck from the gallows.