Entry 2 senses · 2 variants Webster, 1913 dilly /(dĭl"ly̆)/ · dil·ly · IPA /ˈdɪli/ n. n. 01 n. A kind of stagecoach. 1. A kind of stagecoach. 02 n. something remarkable, highly unusual, or exceptionally effective; as, a dilly of a movie; when I make a mistake, it's a dilly. 1. something remarkable, highly unusual, or exceptionally effective; as, a dilly of a movie; when I make a mistake, it's a dilly.