Definition of inside adverb from the Oxford Advanced Learner's Dictionary

      

    inside

     adverb
    adverb
    BrE BrE//ˌɪnˈsaɪd//
     
    ; NAmE NAmE//ˌɪnˈsaɪd//
     
    Prison
     
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  1. 1  on or to the inside She shook it to make sure there was nothing inside. We had to move inside (= indoors) when it started to rain. (figurative) I pretended not to care but I was screaming inside. opposite outside
  2. 2(informal) in prison He was sentenced to three years inside. See related entries: Prison
  3. Word Origin late Middle English (denoting the interior of the body): from in + side.
See the Oxford Advanced American Dictionary entry: inside