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crack

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noun American English pronunciation: crack /kræk/ 
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singularcrack
pluralcracks
  1. 1
    [countable] a line on a surface where something is beginning to break apart

    Many old buildings have cracks in their walls.

    hairline crack (=an extremely thin crack):

    Hairline cracks appear in the paint when it dries too quickly.

  2. 2
    [countable] a narrow opening between two things or parts of things

    She peered out through the crack in the curtains.

  3. 3
    [countable] a sign that an organization, relationship, or plan is weak or beginning to fail

    events which deepened the cracks in the monarchy

    cracks start to appear (in something):

    After only a year cracks started to appear in their marriage.

  4. 4
    [countable] informal a rude or insulting joke about someone or something

    Some of the students were making cracks about her appearance.

    See also  wisecrack
  5. 5
    [countable] Sound effect: crack a short sudden loud noise like a small explosion

    the sharp crack of a single gunshot

  6. 6
    [countable] informal a hard hit on a part of your body

    He got a nasty crack on the head.

  7. 7
    [countable] informal an attempt to do something
    have/take a crack at (doing) something:

    We thought we'd take a crack at running our own business.

  8. 8

    crack

    or

    crack cocaine

    [uncountable] a pure form of the illegal drug cocaine

    crack addicts

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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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