delegitimize

US /ˌdiːləˈdʒɪt̬.ə.maɪz/
UK /ˌdiːləˈdʒɪt̬.ə.maɪz/
1.

ủy quyền

to make something seem not valid or not acceptable:

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If he does not take part in the election, it would delegitimize the entire electoral process.