This is the 11414th most frequent Korean word.
깜빡했다는
"깜빡했다는" means "forgot" or "to have forgotten."
Here, '깜빡했다는' refers to the act of briefly forgetting something, indicating the realization of the fact.
숙제를 깜빡했다는 사실이 생각났다.
I remembered the fact that I had forgotten my homework.
In this sentence, '깜빡했다는' describes the acknowledgment of having briefly forgotten something.
그는 중요한 약속을 깜빡했다는 것을 인정했다.
He admitted that he had forgotten an important appointment.
This instance of '깜빡했다는' conveys the reason for the action stemming from the brief forgetfulness.