"Grass widower" is a dated term used to describe a man whose wife is temporarily away or absent. However, there are a few more modern and inclusive synonyms that could be used instead. For example, "stag" or "bachelor" can work for the unmarried man without a partner, while "long-distance partner" could describe a man whose other half is away for an extended period. Similarly, the more gender-neutral phrase "single parent" could be used for someone whose significant other is absent due to work or other commitments. Ultimately, it's important to use language that is respectful and accurate, and that reflects the diversity of modern partnerships and families.