Same verb · different particle
Same verb, different particle, different meaning. Learn these 3 one at a time, then test yourself.
to officially reduce, weaken, or reverse the effect of a rule, law, policy, or change, especially after it has already been put in place
Example
A: Did you hear about the university's decision on tuition fees?
B: Yeah, they’re going to roll back the increase after all the complaints.
Tell it apart
They rolled back the reforms.
They rolled out the reforms.
To roll out a system or plan means to introduce it to people over a period of time.
Example
A: Has everyone got access to the new software yet?
B: Not yet. They're rolling it out department by department.
Tell it apart
They're rolling out the new system nationwide.
They're phasing in the new system over six months.
To move unused money, credit, data, or another allowance into the next period.
Example
A: Do I lose the credit if I don't spend it today?
B: No, it rolls over to next week.
Tell it apart
Read the sentence, then pick the phrasal verb that belongs in the gap.
Pick one and say it out loud. Save the ones you mix up.