definition of
dog

[1] #1 dog n. [domestic dog, Canis familiaris] a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times; occurs in many breeds; "the dog barked all night". wn

[2] #2 dog v. [chase, chase after, trail, tail, tag, give chase, go after, track] go after with the intent to catch; "The policeman chased the mugger down the alley"; "the dog chased the rabbit". wn

[3] #3 dog n. [frump] a dull unattractive unpleasant girl or woman; "she got a reputation as a frump"; "she's a real dog". wn

[4] #4 dog n. informal term for a man; "you lucky dog". wn

[5] #5 dog n. [cad, bounder, blackguard, hound, heel] someone who is morally reprehensible; "you dirty dog". wn