Definitions

1. noun

a young dog, typically between birth and one year old

“The new family brought home a playful little pup.”

2. noun

a young animal of another species, especially a mammal

“The zoo welcomed a new pup of the endangered species.”

3. verb

to playfully nip or bite, especially in a teasing or affectionate manner

“The excited children were pupping each other during the game.”