re·form /rəˈfôrm/

verb
verb: reform; 3rd person present: reforms; past tense: reformed; past participle: reformed; gerund or present participle: reforming; verb: re_form; 3rd person present: re_forms; past tense: re_formed; past participle: re_formed; gerund or present participle: re_forming
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  1. make changes in (something, typically a social, political, or economic institution or practice) in order to improve it.