a) [countable] when money is moved from one bank account or investment to another without any tax or other fees having to be paid:
Many CD rollovers happen in October.
b) [uncountable and countable] the action of making a bank account, investment etc do this
rollover of
The law allows a rollover of retirement money from a company pension to an IRA.
2 [countable] British English if there is a rollover in a competition or lottery, nobody wins the biggest prize that week, and the money is added to the prize that can be won the following week
3 [countable] an accident in which a car turns over onto its roof
4TD [uncountable] technical a way of making the images change whenever someone using a mouse moves it over a particular word or picture on a computer screen

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