Definition of change back phrasal verb from the Oxford Advanced American Dictionary

 

change back

 phrasal verb
phrasal verb
 
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Phrasal Verbs

change back (into somebody/something)

 
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to return to a previous situation, form, etc. Only time will tell whether things can ever change back to the way they were. The music changed back to a funky disco beat.

change back (into something)

 
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to take off your clothes and put on what you were wearing earlier She changed back into her work clothes.

change something back (into something)

 
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to exchange an amount of money into the currency that it was in before You can change back unused euros into dollars at the bank.
See the Oxford Advanced Learner's Dictionary entry: change back