This is the 5506th most frequent Korean word.
먹었다고
"먹었다고" means "said (someone) ate" or "because (someone) ate" in Korean, depending on context.
Here '먹었다고' is used to convey the act of having eaten as a reported statement.
나는 밥을 다 먹었다고 말했다.
I said that I finished eating.
In this sentence, '먹었다고' reports the information received, showing past completion of eating.
그가 이미 점심을 먹었다고 들었어요.
I heard that he already ate lunch.
The use of '먹었다고' here indicates that the teacher informed others about the completion of eating.