D defs.my
Entry 1 sense Webster, 1913

Forthink

· For·think · IPA
01 v. t. To repent; to regret; to be sorry for; to cause regret.
  1. 1.
    To repent; to regret; to be sorry for; to cause regret.[Obs.]
    “That me forthinketh, quod this January.” Chaucer.