This is the 4588th most frequent Korean word.
가했다
"Added" or "applied."
In this sentence, '가했다' (added) is used to express the act of enriching or enhancing the effort by adding commitment.
그는 노력에 정성을 가했다.
He added dedication to his efforts.
Here, '가했다' indicates the contribution of additional resources to the existing project.
그들은 프로젝트에 자원을 가했다.
They added resources to the project.
In this case, '가했다' implies the act of augmenting the sentence by introducing an element of beauty.