backdoor man
01
隠れた愛人, 不倫相手の男性
a man who has an intimate relationship with a woman who is already in a committed relationship or marriage, often without the knowledge of the partner
disapproving
idiom
informal
例
The tabloids were quick to label the famous actor as a backdoor man after rumors circulated about his affairs with multiple co-stars.
彼女は夫が隠れて浮気していたことを知った。
