(~s, ~ing, ~ed)
1.
If you ~ something such as a door, a room, or a container that has a lock, you open it using a key.
He ~ed the car and threw the coat on to the back seat...
? lock
VERB: V n
2.
If you ~ the potential or the secrets of something or someone, you release them.
Education and training is the key that will ~ our nation’s potential.
VERB: V n