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guard

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noun American English pronunciation: guard /ɡɑrd/ 
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singularguard
pluralguards
  1. 1
    [countable] someone whose job is to protect a place or person so that no one causes damage, steals anything, or escapes

    uniformed border guards

    a prison guard

    post a guard:

    The captain posted two guards at the gate.

    armed guard:

    There was an armed guard on duty outside his door.

    1. a.
      [singular] a group of guards who are working together
      change/relieve the guard:

      The guard was due to be relieved at six o'clock.

  2. 2
    [singular] a unit of soldiers or police officers, especially one that has a particular job

    members of the Presidential guard

    troops belonging to the National Guard

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major on (doing) sth

to have or do a lot of something; to focus on a particular thing

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