Simple past tense and past participle of lock.(verb)
Of a door, etc, that has been locked (with a key).(adjective)
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Use "locked" in a sentence
"Yes, the Portuguese international has the fast track to the award as he will also have Euro 2008 as his exclusive stage there is one player that should have the title locked up by then."
"Corboy began anew, "Have you any idea why he asked you about the term locked-in syndrome?""
"Matt Berger had the title locked up before the feature even began in the Bargain Hunter Sportsman and then he went out and took home the win for good measure."