Definition of straitjacket noun from the Oxford Advanced American Dictionary

     

    straitjacket

     noun
    (also straightjacket)noun
    NAmE//ˈstreɪtˌdʒækət//
     
     
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  1. 1a piece of clothing like a jacket with long arms that are tied to prevent the person wearing it from behaving violently. Straitjackets are sometimes used to control people who are mentally ill.
  2. 2(disapproving) a thing that stops something from growing or developing the straitjacket of taxation
See the Oxford Advanced Learner's Dictionary entry: straitjacket