change by reversal is a verb meaning "change to the contrary". It carries one recorded sense.
change to the contrary
“The trend was reversed”
“the tides turned against him”
“public opinion turned when it was revealed that the president had an affair with a White House intern”
Definitions, synonyms and semantic relations for change by reversal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.