nester

noun [专属名词]穴居的兽；筑巢的鸟；放牧地自耕农；试验筛组的单位筛

I had not felt his remorse over Mom's death, understood his intense loneliness as an "empty nester, " or realized most of his pals had long since light-beamed off the planet.
我并没有体会到母亲去世时他的扼腕之情，也没有理解他作为”空巢老人“强烈的孤独感，更没有意识到他许多朋友已经驾鹤西去。