also: コキュー
noun
cuckold
A man whose wife is unfaithful; a loanword from French 'cocu'. Used in literary or descriptive contexts, not an everyday insult.
from French cocu
彼はコキュにされるのが怖かった。
He was afraid of being made a cuckold.
その小説の主人公はコキュとして描かれている。
The protagonist of that novel is portrayed as a cuckold.