From Longman Dictionary of Contemporary Englishroll something ↔ back phrasal verb1 REDUCEto reduce the influence or power of a law, system, government etc a threat to roll back the legislation of the past 12 years2 especially American EnglishREDUCE to reduce a price, cost etc the administration’s promise to roll back taxes → rollback3 PMDWARto force your opponents in a war to move back from their position4 roll back the years British English to make someone remember something from the past Looking at those old photos really rolled back the years. → roll→ See Verb table
Examples from the Corpus
roll back• The second week involves setting up the rod, taking line out and roll casting.• On the opposite bank, Luke rolled off her back and lay on the grass.• The cat rolls on to its back and pushes itself farther into the light.• Donna rolled on to her back, her eyes half-closed, her limbs numb.• He rolled his head back on his shoulders and looked straight up to the sky.• I rolled on my back, stuck my legs in the air and laughed.• Hateley instantly exploited the error, rolling the ball back to Ian Ferguson and what followed was hell for defender Sergei Fokine.• Ten years ago he restored the engine and replaced the tires, had a friend roll the odometer back to zero.roll back the years• But he rolled back the years wearing his old jockeys' uniform in the Radcliffe Selling Stakes at Nottingham.From Longman Business Dictionaryroll something → back phrasal verb [transitive]COMMERCE to reduce the price of something to a previous levelthe administration’s promise to roll back taxes → roll→ See Verb table 