revirement
/rɪˈvʌɪəm(ə)nt/ /rɪˈvɪəmɒ̃/noun
A turning around or back; a complete change or reversal of an attitude, opinion, or intention.
Origin
Early 19th century. From French revirement act of turning around, complete change of a person's attitude or opinion (although this is apparently first attested slightly later: 1832), change of direction of an evolutionary process (although this is apparently first attested slightly later: 1837) from revirer + -ment.