Entry 2 senses · 2 variants Webster, 1913 Pup /pŭp/ · IPA /pʌp/ n. v. i. 01 n. A young dog; a puppy. 1. A young dog; a puppy.(Zool.) 02 v. i. To bring forth whelps or young, as the female of the canine species. imp. & p. p. Pupped; p. pr. & vb. n. Pupping 1. To bring forth whelps or young, as the female of the canine species.