This is the 208th most frequent Korean word.
크다
"크다" means "to be big" or "to be large."
The word "크다" is used as an adjective in its desctiptive form to describe the size of the house.
이 집은 정말 큽니다.
This house is really big.
The word "크다" in its adverbial form "크게" describes the manner of laughing, indicating increasing volume.
그는 점점 더 크게 웃는다.
He laughs louder and louder.
Here, "크다" is used in its attributive form "큰" to describe the sound as loud, metaphorically referring to its size.