How to say to lock in Korean
Korean: 잠그다[ jam-geu-da ]

Meaning
잠그다 means to make something closed with a lock so other people cannot open it. You can use it for doors, windows, lockers, and bicycles. In daily life, people often use this word when leaving home, going to school, or keeping things safe.
Example sentences
집에 가기 전에 창문을 잠궜어요.
I locked the window before going home.
자전거를 잠가야 해요.
You should lock the bike.
호텔 방을 나가면서 문을 잠uxtap니다.
I locked the hotel room door when I left.
사물함을 꼭 잠그세요.
Please lock the locker.