low blow
noun [ C usually singular ] uk/ˌləʊ ˈbləʊ/ us/ˌloʊ ˈbloʊ/
不公平的批评;卑鄙的行为
a criticism or unkind act that is unexpected and unfair
Criticizing his wife’s family was a low blow. 批评他妻子的家庭是一种卑劣的行为。
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