Meaning of UNLOCK in English
un ‧ lock /ʌnˈlɒk $ -ˈlɑːk/ BrE AmE verb [transitive]
1 . to unfasten the lock on a door, box etc
2 . unlock the secrets/mysteries of something to discover important facts about something
• • •
▪ open used about a door, window, container, package, letter, your eyes, or your mouth:
I opened the door quietly.
She was nervous about opening the letter.
Open your mouth wide.
▪ unlock to open a door, drawer, box etc with a key:
You need a key to unlock the safe.
▪ unscrew to open a lid on a bottle, container etc by turning it:
I carefully unscrewed the lid of the jar.
▪ force open to open a drawer, window, cupboard etc using force:
The door was locked so we had to force it open.
▪ unwrap to open a package by removing the paper that covers it:
The children were busy unwrapping their Christmas presents.
▪ unfasten/undo to make something no longer fastened or tied, for example a seat belt or a piece of clothing:
He unfastened the top button of his shirt.
I was so full I had to undo my belt.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012