afterthought

Noun	1.	afterthought - thinking again about a choice previously made; "he had second thoughts about his purchase" rethink, second thought, reconsideration change of mind, flip-flop, turnabout, turnaround, reversal - a decision to reverse an earlier decision
	2.	afterthought - an addition that was not included in the original plan; "the garage was an afterthought" add-on, addition, improver - a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor"

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