Definition of forthink
now chiefly Scottish : to change the mind of (oneself); often : regret
now chiefly Scottish : to have a change of mind or a feeling of regret
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Origin and Etymology of forthink
Middle English forthinken, forthenken to regret, repent, displease, be displeased; partly from for- + thinken to seem; partly from Old English forthencan to mistrust, despise, despair, from for- + thencan to think
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