unlock
1. [ verb ] open the lock of
Examples:

"unlock the door"

Related terms: lock open
2. [ verb ] set free or release
Related terms: disengage
3. [ verb ] become unlocked
Examples:

"The door unlocked from the inside"

Related terms: lock lock disengage
Similar spelling:   unlocked
  unlucky
  unalike
  unluckily
  unlocated