grass widower 离了婚的男人；与妻子分居的男人；妻子一时不在身边的男人；留守男士

【例句】
Mr. Zhang is a grass widower.
张先生是个离了婚的男人。

After his wife passed away, he became a grass widower and lived alone in their house.
妻子去世后，他成了一个留守男士，独自住在他们家里。