Are these two verbs the same? According to Longman, they are the same.
Here are some made up sentences:
I rolled this (up) into a ball.
Let's roll (up) our sleeves.
(I made up these sentences just to ask if they could mean the same.)
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In the examples you gave, both "roll" and "roll up" mean the same thing. However, there is a difference between the two verbs. To "roll" can mean many things but the only senses that are synonyms with "roll up" are "to form into a mass by turning over and over" and "to wrap round on itself or shape into a ball or roll". To "roll up" can also mean "to become larger by successive accumulations", among other things that "roll" alone doesn't mean.
They mean the same in that things are being rolled up, but in different ways. Rolling up sleeves means to uncover more skin, and to roll something up into a ball means to do something like crumpling a piece of paper up before throwing it out.