unlock

verb
     
un‧lock [transitive]
1 to unfasten the lock on a door, box etc
2

unlock the secrets/mysteries of something

to discover important facts about something

Dictionary results for "unlock"
Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.