Japan used to approve of polygamy too.
"I can't believe polygamy exists," Viet said accusingly. "You can turn that finger around,” Koichi retorted with a smile.
It’s not like all men support polygamy.
One husband, many wives. Sounds a bit sketchy. This is polygamy.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just note that the 一 gets changed to いっ and the 夫 gets changed to ぷ from ふう for some reason. You can imagine that this is because when you are the type that has many wives, you're probably the type who makes them clean up your poo for you as well.