Definition of stock adjective from the Oxford Advanced American Dictionary

     

    stock

     adjective
    adjective
    NAmE//stɑk//
     
    [only before noun]
     
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  1. 1 (disapproving) a stock excuse, answer, etc. is one that is often used because it is easy and convenient, but that is not very original “No comment,” was the actor's stock response. Her stock excuse was: “I'm washing my hair tonight.”
  2. 2 usually available for sale in a store synonym standard stock sizes
See the Oxford Advanced Learner's Dictionary entry: stock