Definition of sippy cup noun from the Oxford Advanced Learner's Dictionary

     

    sippy cup

     noun
    noun
    BrE BrE//ˈsɪpi kʌp//
     
    ; NAmE NAmE//ˈsɪpi kʌp//
     
    (North American English, informal)
     
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  1. 1a cup with a lid that has holes in it so that a baby can suck liquid from it The baby was drinking milk from a sippy cup.
  2. 2(especially North American English) a cardboard or plastic cup with a lid with a hole in it, that is used when you buy a drink to take away and drink somewhere else
See the Oxford Advanced American Dictionary entry: sippy cup