What's the difference between forethink and forthink?

Forethink

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Definition:

• (v. t.) To think beforehand; to anticipate in the mind; to prognosticate.
• (v. t.) To contrive (something) beforehend.
• (v. i.) To contrive beforehand.

Example Sentences:

Forthink

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Definition:

• (v. t.) To repent; to regret; to be sorry for; to cause regret.

Example Sentences: