This is the 3627th most frequent Korean word.
보증
Guarantee or warranty.
It indicates a promise or assurance regarding quality.
이 제품은 품질을 보증합니다.
This product guarantees quality.
It suggests a personal assurance or endorsement regarding the friend's capability.
나는 친구의 갚을 능력을 보증했어요.
I vouched for my friend's ability to repay.
It refers to a person who legally assumes responsibility for another's obligations.