(verb) open the lock of. Synonyms: unlock. Example: "Unlock the door."
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Verb Definition 1
(verb) set free or release. Synonyms: unlock.
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Verb Definition 2
(verb) become unlocked. Synonyms: unlock. Example: "The door unlocked from the inside."
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Verb Definition 3
(adj) not firmly fastened or secured. Synonyms: unbarred, unbolted, unlatched, unsecured. Examples: "An unbarred door." "Went through the unlatched gate into the street." "An unlocked room."