锁定

suǒ dìngsuoding

1. to lock (a door)
2. to close with a latch
3. to lock into place
4. a lock
5. a latch
6. to lock a computer file (to prevent it being overwritten)
7. to lock (denying access to a computer system or device or files, e.g. by password-protection)
8. to focus attention on

Study it in Yanamino