Word forms: plural rollovers1. countable noun [usually singular]In a lottery draw, a rollover is a prize that includes the prize money from the previous draw, because nobody won it.
2. countable noun [usually singular]In finance, a rollover is when a loan or other financial arrangement is extended.
3. countable nounA rollover is an incident where a vehicle or boat turns over completely, usually finishing the right way up.
It is hoped anti-lock brakes will prevent rollovers.