go off withsb
—phrasal verbwithgoverbuk/ɡəʊ/us/ɡoʊ/present participlegoing|past tensewent|past participlegone
toleaveawife,husband, orpartnerinorderto have asexualorromanticrelationshipwith someoneelse
移情别恋于（某人）
Did youknowthat Hugh had gone off with hissister-in-law?你知不知道休跟他的嫂子好上了？