Definition
Used, especially in the past, to call out to people to attract them to come and pay to see something unusual or interesting.
"Roll up! Roll up! Come see the man who breathes fire!" the circus barker yelled.
"Roll up! Roll up! This is the smallest man in the world!" the amusement park manager shouted.
At the entrance of old-fashioned funfairs, you could always hear the cry "Roll up! Roll up! Come and see the rare animal specimens!"