This is the 1756th most frequent Korean word.
제안을
"제안을" means "proposal" or "suggestion" in English.
Here, '제안을' is the direct object ('proposal') of the verb '거절했다' ('rejected').
그는 내 제안을 거절했다.
He rejected my proposal.
Here, '제안을' represents the direct object ('suggestion') of the verb '수락했습니다' ('accepted').
저는 그의 제안을 수락했습니다.
I accepted his suggestion.
Here, '제안을' is the direct object ('suggestion') of the verb '하기' ('making').