The term "rollover" has several meanings depending on its context.
1) In finance, a rollover refers to the process of transferring funds from one investment to another while deferring taxes. For example, an individual may roll over their retirement savings into a new account without having to pay taxes on the transferred amount.
2) In telecommunications, a rollover is when a call is redirected to voicemail because the called party's line is busy or not in use.
3) In sports, particularly auto racing and horse racing, a rollover refers to an event where a vehicle flips over during a race.
4) Finally, "rollover" can also refer to the act of falling over or collapsing, as when someone trips and falls forward.