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Definition of inside noun from the Oxford Advanced American Dictionary

     

    inside

     noun
    noun
    NAmE//ˌɪnˈsaɪd//
     
    , NAmE//ˈɪnsaɪd//
     
     
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  1. 1[countable, usually singular] the inside the inner part, side, or surface of something The inside of the box was blue. The door was locked from the inside. The shell is smooth on the inside. the insides of the windows opposite outside
  2. 2the inside [singular] the part of a curved road or track nearest to the middle or shortest side of the curve The French runner is coming up fast on the inside. opposite the outside
  3. 3insides [plural] (informal) a person's stomach and bowels She was so nervous, her insides were like jelly. He complained of a pain in his insides.
    4. Idioms
    inside out
     
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    with the part that is usually inside facing out You've got your sweater on inside out. Turn the bag inside out and let it dry. opposite right side up
    know somebody/something inside out, know somebody/something like the back of your hand (informal)
     
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    to be very familiar with something This is where I grew up. I know this area like the back of my hand.
    on the inside
     
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    belonging to a group or an organization and therefore able to get information that is not available to other people The thieves must have had someone on the inside helping them.
      turn something inside out
       
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    1. 1to make a place very messy when you are searching for something The burglars had turned the house inside out.
    2. 2to cause large changes The new manager turned the old systems inside out.
See inside in the Oxford Advanced Learner's Dictionary
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