Real Dictionary

roll up
phrasal verb: If you roll up your sleeves or trouser legs, you fold the ends back several times, making them shorter.

roll-up
to accumulate; collect
to form or cause to form a cylindrical shape
to make or put into the form of a roll
countable noun: A roll-up is a cigarette that someone makes for themself, using tobacco and cigarette papers.
noun: a cigarette made by hand from loose tobacco and cigarette paper
noun: something, as a carpet or window shade, that can be rolled up when not in use