To think about after the fact, reflect on.
To repent, or feel remorse for; to regret.
Do not afterthink except for poetic or P.S. reasons. Never afterthink to "improve" or defray impressions, as the best writing is always the most painful personal wrung-out tossed from cradle warm protective mind – tap from yourself the song of yourself, blow! – now! [...]
Compound of after- + think, probably a calque of Ancient Greek μετάνοια (metánoia).
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