After retirement, they chose to rusticate in the countryside for a peaceful life.

rusticate 是动词，由拉丁词根 rus（乡村）和后缀 -ate（使成为...）组成，字面意思是"使乡村化"。在这里指"过乡村生活"或"隐居乡间"，带有远离城市喧嚣、回归田园生活的意味。