Definition of grass widow noun from the Oxford Advanced Learner's Dictionary

 

grass widow

 noun
noun
BrE
 
; NAmE
 
 
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a woman whose husband is away from home for long periods of time Word Origin early 16th cent. (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’.
See the Oxford Advanced American Dictionary entry: grass widow