buyer's remorse
noun [ U ] (also buyers' remorse) uk/ˌbaɪ.əz rɪˈmɔːs/ us/ˌbaɪ.ɚz rɪˈmɔːrs/
买家懊悔，事后悔恨
a feeling of regret (= a wish that you had not done something) after making a choice or decision
Maybe some voters are experiencing buyers' remorse. 也许有的选民正在为自己当初的决定懊恼不已。
The court dismissed the complaints about the contracts as "buyer's remorse". 法院驳回了对合同的申诉，认为这属于事后懊悔。