Source : Webster's Revised Unabridged Dictionary (1913)

Forlet \For*let"\, v. t. [OE. forleten, AS. forl[=ae]tan; pref.
   for- + l[=ae]tan to allow; akin to G. verlassen to leave. See
   {Let} to allow.]
   To give up; to leave; to abandon. [Obs.] ``To forlet sin.''
   --Chaucer.