Definition of pet adjective from the Oxford Advanced American Dictionary

 

pet

 adjective
adjective
NAmE//pɛt//
 
[only before noun]
 
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  • that you are very interested in his pet subject/theory/project, etc. see also pet name
  • Idioms
    somebody's pet peeve
     
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    something that you particularly dislike
    See the Oxford Advanced Learner's Dictionary entry: pet