1.
If you ~ your sleeves or trouser legs, you fold the ends back several times, making them shorter.
The jacket was too big for him so he rolled up the cuffs...
Walking in the surf, she had to roll her pants up to her knees.
PHRASAL VERB: V P n (not pron), V n P
see also rolled-up
2.
If people ~ somewhere, they arrive there, especially in large numbers, to see something interesting. (INFORMAL)
Roll up, ~, come and join The Greatest Show on Earth...
The first reporters rolled up to the laboratory within minutes.
PHRASAL VERB: V P, V P prep/adv
3.
see also roll 6, rolled-up