roll ‧ ov ‧ er /ˈrəʊləʊvə $ ˈroʊloʊvər/ BrE AmE noun
1 .
a) [countable] when money is moved from one bank account or ↑ investment to another without any tax or other ↑ fee s 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
4 . [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