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lock

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verb British English pronunciation: lock /lɒk/ 
Word Forms
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present tense
I/you/we/theylock
he/she/itlocks
present participlelocking
past tenselocked
past participlelocked
  1. 1
    [transitive] to fasten something such as a door or a container, usually with a key, so that other people cannot open it

    John went out and locked the door behind him.

    Have you locked the car?

    lock something in something:

    She locked the documents in the safe.

    1. a.
      [intransitive] to become fastened with a lock

      The door slammed and locked.

      This drawer won't lock.

  2. 2
    [intransitive] if something locks in a particular position, it is firmly fixed or held in that position

    The brakes locked and the car spun off the road.

    1. a.
  3. 3
    [transitive] computing to prevent information on a computer from being changed or looked at by someone who does not have permission

    All entries are locked so no unauthorized modifications can be made.

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