reversal [rɪˈvɜ:sl]

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n.倒转，颠倒；反复；逆转，反转；[法]撤销

when something changes to its opposite

That would be a reversal of the order of host and guest.这样做就主客颠倒了。
That would be reversal of the order of host and guest.这就主客颠倒了。