disapproval If you forsake someone, you leave them when you should have stayed, or stop you helping them or looking after them. I still love him and I would never forsake him
[ f&r-'sAk, for- ] (transitive verb.) before 12th century. Middle English, from Old English forsacan, from for- + sacan to dispute; akin to Old English sacu action at law; more at SAKE.