"this old moon ... like to a stepdame"
Simile
Act 1,
Scene 1
Lines 1-6
[Ancient Athens. Enter Duke Theseus, ruler of Athens; Hippolyta, his soon to be wife; Philostrate, a nobleman; and various attendants]
Theseus
Theseus is comparing his having to wait until the new moon for his wedding day to a son’s having to wait until his widowed mother or step-mother dies before he can inherit the family estate. The widow's continued existence is "withering" out, dragging out, the time the son must wait for his inheritance. The word "withering" also brings to mind the image of an old woman withering away, shriveling up.