(transitive, archaic or UK dialectal) To abandon; give up; leave; leave behind; forsake; desert; neglect.
to forlet your sins
I soothly quoth, then say, to you, for that each such, he that forlets wife his, be-out unclean lust doing forth-lying thing, doeth (works) he doeth the same to sin, …
… whether his mind and his soul were deadly and perishing, or it were aye living and eternal; and again, about his good, what it was, and what good was best for him to do, and what evil to forlet.