noun
post-retirement job; work after retirement
Refers to work undertaken after retiring from one's main career, often for personal satisfaction or to stay active rather than primarily for income.
父は退職後、隠居仕事として近所の子供たちに将棋を教えている。
After retiring, my father teaches shogi to neighborhood children as a post-retirement job.
Compound of 隠居 (いんきょ, 'retirement') and 仕事 (しごと, 'work').