grass widow 
noun
A woman whose husband is away often or for a prolonged period: grass widows parted from their husbands by golf or similar obsessional activities...
- Because John traveled for his work as a steamfitter, Eliza apparently experienced life as a grass widow more than once.
- Remarriage or the establishment of an independent household was not a possibility for all ‘grass widows,’ a popular term for deserted and divorced women.
- She waited until the lights of Freetown had disappeared below the horizon, and then she quickly organised herself as the centre of the gayest, noisiest group of grass widows and unattached bachelors on the ship.
Origin
Early 16th century (denoting an unmarried woman with a child): from grass + widow, perhaps from the idea of the couple having lain on the grass instead of in bed. The current sense dates from the mid 19th cent; compare with Dutch grasweduwe and German Strohwitwe 'straw widow'.