1 to change something, such as a decision, judgment, or process so that it is the opposite of what it was before
opposite
[transitive] reverse a trend/process/decline etc
More changes are required to reverse the trend towards centralised power.
More changes are required to reverse the trend towards centralised power.2 if a vehicle or its driver reverses, they go backwards [= back up American English]
car
[intransitive and transitive]TTC especially British English3 to change around the usual order of the parts of something, or the usual things two people do
change position/purpose
[transitive]4 to turn something over or around, in order to show the back of it :
Reverse the paper in the printer.
turn something over
[transitive]
Reverse the paper in the printer.5 to change your opinion or position in an argument :
Suddenly, he reversed himself completely.
reverse yourself
American English
Suddenly, he reversed himself completely.6 to make a telephone call which is paid for by the person you are telephoning [= call collect American English]

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