This is the 12077th most frequent Korean word.
높인다
"높인다" means "to raise" or "to elevate."
Here, '높인다' is used to mean 'increasing' or 'raising' the grades through some action or effort.
그녀는 아이들의 성적을 높인다.
She improves the children's grades.
In this case, '높인다' is referring to enhancing or improving the level of customer satisfaction.
이 회사는 고객 만족도를 높인다.
This company increases customer satisfaction.
Here, '높인다' suggests elevating or improving the level or standard of efficiency.