Difference between to sleep and to lock in Korean
잠자다·잠그다

잠자다to sleep
"To sleep" means to rest with your eyes closed, usually at night or during a nap. In Korean, 잠자다 is used when someone goes to sleep or is sleeping. You can use it for people and animals in everyday situations.

잠그다to lock
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.
The difference
to sleep (잠자다) and to lock (잠그다) are nearby Korean vocabulary items learners often meet together. Use “to sleep” when "To sleep" means to rest with your eyes closed, usually at night or during a nap. In Korean, 잠자다 is used when someone goes to sleep or is… Use “to lock” when 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.…