What is Roll up ?
Roll up is (verb) 1. to turn something flat over and over on itself until it is a tube He rolled up the carpet or rolled the carpet up. A hedgehog will roll up into a ball if you touch it. 2. to arrive They just rolled up and asked if we could put them up for the night. The bridegroom finally rolled up an hour late and said he’d had a puncture.
source: Easier English, Student Dictionary Upper Intermediate Level