To Retire
To Be Retired, To Go Into Retirement
する verb
隠居 is "retirement". Make that a verb and you have to retire, to be retired, or to go into retirement.
Like 隠居, this word emphasizes life after retiring, and usually implies having a quiet, maybe secluded, lifestyle. It's a bit of an old-fashioned word, but you'll still see it in modern writing.
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.
病気のせいで、隠居することになりました。
My illness ended up forcing me into retirement.
私の父は農村で隠居しています。
My father is retired in a farming village.
社会人生活に嫌気がさしたので、持っている株を全て売って隠居することにしました。
I was fed up with my working life, so I decided to sell all my stocks and go into retirement.