WordNet records no synonym and no antonym for roll over. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
make a rolling motion or turn
“The dog rolled over”
negociate to repay a loan at a later date for an additional fee
“roll over a loan”
Synonyms, antonyms and the broader and narrower relations for roll over come from Princeton University’s WordNet. Full sources and licences.
re-invest (a previous investment) into a similar fund or security
“She rolled over her IRA”