As word
1an4
built-in lock; concealed lock (flush with the surface, with only the keyhole visible) (contrasted with 明鎖|明锁 [ming2 suo3] "exposed lock") 2suo3
built-in lock; concealed lock (flush with the surface, with only the keyhole visible) (contrasted with 明鎖|明锁 [ming2 suo3] "exposed lock")