locking

/ˈlɑkɪŋ/
adjective
  1. Designed to fasten or secure something so it cannot be opened or moved easily.
    • She bought a locking cabinet to store important documents.
    • Make sure the locking latch is engaged before you leave.
    • The door has a locking mechanism that requires a key.
noun
  1. The act or process of fastening or securing something.
    • The locking of the safe takes only a few seconds.
    • He demonstrated the proper locking of the bicycle chain.
    • Automatic locking of the car doors happens when you start the engine.
Synonyms