cuckold
noun [ C ] old-fashioned disapproving uk/ˈkʌk.əʊld/ us/ˈkʌk.oʊld/
戴绿帽子的人，妻子有外遇的人
a man whose wife deceives him by having a sexual relationship with another man
cuckold
verb [ T ] old-fashioned disapproving uk/ˈkʌk.əʊld/ us/ˈkʌk.oʊld/
给…戴绿帽子；与…的妻子通奸
If a man is cuckolded, his wife has a sexual relationship with another man.
Compare: betray