Sentence:  Isis <WSD>transsexes</WSD> Iphis, female to male (Met. 9.668: Iphide mutata) in the nick of time (unusque dies restabat) on his/her wedding day. 
Meaning of the word marked with <WSD> tags:  To transgender; to (cause something to) change from being sexed/gendered in one way to being sexed/gendered in another way.